thatasian
thatasian
25-11-2016
Mathematics
contestada
Prove the identity with steps.
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bartdrinksmalk
bartdrinksmalk
25-11-2016
Remember that a double angle formula for cosine is
[tex]\cos(2x)=\cos^{2}x-\sin^{2}x[/tex]
So
[tex]\cos^{2}(2x)-\sin^{2}(2x)=\cos(4x)[/tex]
[tex]\rightarrow \cos^{2}(2x)-\sin^{2}(2x)=\cos(2*2x)[/tex]
[tex]\rightarrow \cos^{2}(2x)-\sin^{2}(2x)=\cos^{2}(2x)-\sin^{2}(2x)[/tex]
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