MartynBH
Answered

Verify the identities.


cos(4u) = cos^2(2u) - sin^2(2u)

[cot^2(x)/csc(x)+1] = {1-sin(x)/sin(x)]

sin(x+ pi/2)=cos(x)
Plz help.

Verified Answer :

nobillionaireNobley

\(cos(4u)=cos(2u+2u) \\ =cos(2u)cos(2u) - sin(2u)sin(2u) \\ = cos^{2} (2u)- sin^{2} (2u)\)

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