Question

Sin^4x-cos^4x=sin^2x-cos^2x

Answer 1

Step-by-step explanation:

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Answer 2

Answer:

Its given below

Step-by-step explanation:

a2 − b2 = ( a − b ) ( a + b ) )

We know,

cos 2x + sin 2 x = 1

LHS

sin 4 x  −  cos 4 x  

=  ( sin 2 x − cos 2 x ) ( sin 2 x  +  cos 2 x )  

=  sin 2 x  −  cos2 x