Baitap luonggiac11nc

1. CHAN MEI QUI – HTTP://QUI81.TK
1 1
cos
2 2
x 2
tan 3
6
x sin(8cos ) 0x
2
sin( 4 ) 0x x ( cos ) cos( sin )x x x
(1 2)(sin cos ) sin2 1 2 0x x x
1
4
3
8
3
4
1
4
3 3
sin cos cos2x x x
3 cos cos 1 2x x 2sin( ) tan cot
4
x x x
2 23 1
cos sin 2
4 4
x x
2 1 cos
tan
1 sin
x
x
x
2 1 cos
cot
1 sin
x
x
x
sin cosx x
1 sin2
cos2 0
2
x
x
24
cos cos
3
x
x
2 2
4sin 3tan 2 4sin 2 3 tanx x x x
2 2
4cos 3cot 4 3cos 2 3cot 4 0x x x x