5-tan-2-x-cos-2-x-2cosx-a-then-find-then-find-the-value-of-cos4x-

Question Number 23718 by vick007 last updated on 05/Nov/17

5 (\tan^{2} x - \cos^{2} x) = 2 c o s x + a t h e n f i n d

t h e n f i n d t h e v a l u e o f c o s 4 x . ? ? ?

Commented by vick007 last updated on 04/Nov/17

p l e a s e a n s m e s o o n \dots

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