Trig identities ques. #39 &40

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#39
2
1 cos
tan
=
1
cos
sec
2 2
2
2
1
1 1
1
1
1
1
1
1
(using conjugates)
cos sec
sec sec
cos
cos
sec
cos
sec
cos
tan
L.S=R.S.
#40
2
1 11
1 1
sin cos cossin
cos cos sin
2
2
1 1
1
1 1
Taking common denominator
sin cos cos
cos
sin cos cos
sin
L.S.=R.S.

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Trig identities ques. #39 &40

1. #39 2 1 cos tan = 1 cos sec 2 2 2 2 1 1 1 1 1 1 1 1 1 (using conjugates) cos sec sec sec cos cos sec cos sec cos tan L.S=R.S. #40 2 1 11 1 1 sin cos cossin cos cos sin 2 2 1 1 1 1 1 Taking common denominator sin cos cos cos sin cos cos sin L.S.=R.S.