6. Sum & Difference of Anglesy
x
1
P
1
x
y
cos
1
x
cosx
cos ,sin
7. Sum & Difference of Anglesy
x
1
P
1
x
y
cos
1
x
cosx
sin
1
sin
y
y
cos ,sin
8. Sum & Difference of Anglesy
x
1
P
1
x
y
cos
1
x
cosx
sin
1
sin
y
y
cos ,sin
Q cos ,sin
9. Sum & Difference of Anglesy
x
1
P
1
x
y
cos
1
x
cosx
sin
1
sin
y
y
cos ,sin
Q cos ,sin
By trigonometry
10. Sum & Difference of Anglesy
x
1
P
1
x
y
cos
1
x
cosx
sin
1
sin
y
y
cos ,sin
Q cos ,sin
By trigonometry
2 2 2
1 1 2 1 1 cosPQ
11. Sum & Difference of Anglesy
x
1
P
1
x
y
cos
1
x
cosx
sin
1
sin
y
y
cos ,sin
Q cos ,sin
By trigonometry
2 2 2
1 1 2 1 1 cosPQ
2
2 2cosPQ
12. Sum & Difference of Anglesy
x
1
P
1
x
y
cos
1
x
cosx
sin
1
sin
y
y
cos ,sin
Q cos ,sin
By trigonometry
2 2 2
1 1 2 1 1 cosPQ
2
2 2cosPQ
By coordinate geometry
13. Sum & Difference of Anglesy
x
1
P
1
x
y
cos
1
x
cosx
sin
1
sin
y
y
cos ,sin
Q cos ,sin
By trigonometry
2 2 2
1 1 2 1 1 cosPQ
2
2 2cosPQ
2 22
cos cos sin sinPQ
By coordinate geometry
14. Sum & Difference of Anglesy
x
1
P
1
x
y
cos
1
x
cosx
sin
1
sin
y
y
cos ,sin
Q cos ,sin
By trigonometry
2 2 2
1 1 2 1 1 cosPQ
2
2 2cosPQ
2 22
cos cos sin sinPQ
2 2 2 2 2
cos 2cos cos cos sin 2sin sin sinPQ
By coordinate geometry
15. Sum & Difference of Anglesy
x
1
P
1
x
y
cos
1
x
cosx
sin
1
sin
y
y
cos ,sin
Q cos ,sin
By trigonometry
2 2 2
1 1 2 1 1 cosPQ
2
2 2cosPQ
2 22
cos cos sin sinPQ
2 2 2 2 2
cos 2cos cos cos sin 2sin sin sinPQ
By coordinate geometry
2
2 2cos cos 2sin sinPQ
17. 2 2cos 2 2cos cos 2sin sin
cos cos cos sin sin
18. 2 2cos 2 2cos cos 2sin sin
cos cos cos sin sin
Replace with
19. 2 2cos 2 2cos cos 2sin sin
cos cos cos sin sin
Replace with
cos cos cos sin sin
20. 2 2cos 2 2cos cos 2sin sin
cos cos cos sin sin
Replace with
cos cos cos sin sin
cos cos (even function i.e. )f x f x
21. 2 2cos 2 2cos cos 2sin sin
cos cos cos sin sin
Replace with
cos cos cos sin sin
cos cos (even function i.e. )f x f x
sin sin (odd function i.e. )f x f x
22. 2 2cos 2 2cos cos 2sin sin
cos cos cos sin sin
Replace with
cos cos cos sin sin
cos cos (even function i.e. )f x f x
sin sin (odd function i.e. )f x f x
cos cos cos sin sin
23. 2 2cos 2 2cos cos 2sin sin
cos cos cos sin sin
Replace with
cos cos cos sin sin
cos cos (even function i.e. )f x f x
sin sin (odd function i.e. )f x f x
cos cos cos sin sin
sinsincoscoscos
24. 2 2cos 2 2cos cos 2sin sin
cos cos cos sin sin
Replace with
cos cos cos sin sin
cos cos (even function i.e. )f x f x
sin sin (odd function i.e. )f x f x
cos cos cos sin sin
cos, cos, sin, sin
sinsincoscoscos
25. 2 2cos 2 2cos cos 2sin sin
cos cos cos sin sin
Replace with
cos cos cos sin sin
cos cos (even function i.e. )f x f x
sin sin (odd function i.e. )f x f x
cos cos cos sin sin
cos, cos, sin, sin
sinsincoscoscos
26. 2 2cos 2 2cos cos 2sin sin
cos cos cos sin sin
Replace with
cos cos cos sin sin
cos cos (even function i.e. )f x f x
sin sin (odd function i.e. )f x f x
cos cos cos sin sin
cos, cos, sin, sin
sinsincoscoscos
27. 2 2cos 2 2cos cos 2sin sin
cos cos cos sin sin
Replace with
cos cos cos sin sin
cos cos (even function i.e. )f x f x
sin sin (odd function i.e. )f x f x
cos cos cos sin sin
cos, cos, sin, sin
sinsincoscoscos
28. 2 2cos 2 2cos cos 2sin sin
cos cos cos sin sin
Replace with
cos cos cos sin sin
cos cos (even function i.e. )f x f x
sin sin (odd function i.e. )f x f x
cos cos cos sin sin
cos, cos, sin, sin
sinsincoscoscos
29. 2 2cos 2 2cos cos 2sin sin
cos cos cos sin sin
Replace with
cos cos cos sin sin
cos cos (even function i.e. )f x f x
sin sin (odd function i.e. )f x f x
cos cos cos sin sin
cos, cos, sin, sin
If it’s not the sine
sinsincoscoscos
30. 2 2cos 2 2cos cos 2sin sin
cos cos cos sin sin
Replace with
cos cos cos sin sin
cos cos (even function i.e. )f x f x
sin sin (odd function i.e. )f x f x
cos cos cos sin sin
cos, cos, sin, sin
If it’s not the sine,it’s not the sign
sinsincoscoscos
47. tan
sin
tan
cos
48. tan
sin
tan
cos
sin cos cos sin
tan
cos cos sin sin
49. tan
sin
tan
cos
sin cos cos sin
tan
cos cos sin sin
sin cos cos sin
cos cos cos cos
tan
cos cos sin sin
cos cos cos cos
50. tan
sin
tan
cos
sin cos cos sin
tan
cos cos sin sin
sin cos cos sin
cos cos cos cos
tan
cos cos sin sin
cos cos cos cos
tan tan
tan
1 tan tan
51. tan
sin
tan
cos
sin cos cos sin
tan
cos cos sin sin
sin cos cos sin
cos cos cos cos
tan
cos cos sin sin
cos cos cos cos
tan tan
tan
1 tan tan
Replace with
52. tan
sin
tan
cos
sin cos cos sin
tan
cos cos sin sin
sin cos cos sin
cos cos cos cos
tan
cos cos sin sin
cos cos cos cos
tan tan
tan
1 tan tan
Replace with
tan tan
tan
1 tan tan
53. tan
sin
tan
cos
sin cos cos sin
tan
cos cos sin sin
sin cos cos sin
cos cos cos cos
tan
cos cos sin sin
cos cos cos cos
tan tan
tan
1 tan tan
Replace with
tan tan
tan
1 tan tan
tan tan
(odd function i.e. )f x f x
54. tan
sin
tan
cos
sin cos cos sin
tan
cos cos sin sin
sin cos cos sin
cos cos cos cos
tan
cos cos sin sin
cos cos cos cos
tan tan
tan
1 tan tan
Replace with
tan tan
tan
1 tan tan
tan tan
(odd function i.e. )f x f x
tan tan
tan
1 tan tan
57. tan plus tan
on one minus tan, tan
tantan1
tantan
tan
58. tan plus tan
on one minus tan, tan
tantan1
tantan
tan
Sum and Difference of Angles
59. tan plus tan
on one minus tan, tan
tantan1
tantan
tan
Sum and Difference of Angles
sincoscossinsin
60. tan plus tan
on one minus tan, tan
tantan1
tantan
tan
Sum and Difference of Angles
sincoscossinsin
sinsincoscoscos
61. tan plus tan
on one minus tan, tan
tantan1
tantan
tan
Sum and Difference of Angles
sincoscossinsin
sinsincoscoscos
tantan1
tantan
tan