Question

cos^2(π/4)-sin^2(π/4)​

Answer 1

Step-by-step explanation:

cos (pi / 4) = 1/ root 2

sin (pi/ 4) = 1/ root 2

so,

cos^2(1/ root 2) - sin^2( 1/ root 2)

cos 2(1/root 2)^ - sin 2(1/root 2)^

cos 2(1/2) - sin 2(1/2)

[ 2 and 2 get cancelled ]

=0

Answer 2

Answer:

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