Can someone please help!!?!?!
find sin 2x cos 2x and tan 2x from given info:
tan x=-1/3 ,cosx0

Use the formulas for lowering powers to rewrite the expression in terms of the first power of cosine
a)sin^4x b) cos^4xsin^4x

Use an appropriate half angle formula to find the exact value of the expression
a) 2sin18degreescos18degrees

Prove the identity
a) cos^2 5x-sin^25x=cos10x
b) tan 3x=3tanx-tan^3x/1-3tan^2x

Question

Can someone please help!!?!?!
find sin 2x cos 2x and tan 2x from given info:
tan x=-1/3 ,cosx>0

Use the formulas for lowering powers to rewrite the expression in terms of the first power of cosine 
a)sin^4x         b) cos^4xsin^4x

Use an appropriate half angle formula to find the exact value of the expression 
a) 2sin18degreescos18degrees  

Prove the identity
a) cos^2 5x-sin^25x=cos10x
b) tan 3x=3tanx-tan^3x/1-3tan^2x

anonymous · Answer

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