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20-11-2017
Mathematics

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cos^2 2A+4sin^2A×cos^2 A=1

Respuesta :

20-11-2017

Using Sin^2 and Cos^2 identities,
= Cos^2(2A) + 4[(1/2)(1-Cos(2A)][(1/2)(1+Cos(2A)] = 1
= Cos^2(2A) + 1 -Cos^2(2A) = 1
0 = 0
There is nothing to solve for as it is an identity of sorts.

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