SOLUTION: Can you please help me solve this trigonometric identities question: 1)Prove the following identities. a) {{{sin^2 (x) - cos^2 (x) = 2sin^2 (x) - 1}}}

SOLUTION: Can you please help me solve this trigonometric identities question: 1)Prove the following identities. a) {{{sin^2 (x) - cos^2 (x) = 2sin^2 (x) - 1}}}

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Question 204705: Can you please help me solve this trigonometric identities question: 1)Prove the following identities.
a)
Answer by alicealc(293) (Show Source): You can put this solution on YOUR website!
there is an identity formula of trigonometry :

by using that formula:

so:

=
=

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