I have partially solved a question. Prove that: (sin x)^2 - (sin y)^2 = (sin x cos y)^2 - (cos x sin y)^2
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Originally Posted by Stuck Man I have partially solved a question. Prove that: (sin x)^2 - (sin y)^2 = (sin x cos y)^2 - (cos x sin y)^2
Thanks. I didn't know the formula used twice by the first line. Is there a standard formula for that?
Originally Posted by Stuck Man Thanks. I didn't know the formula used twice by the first line. Is there a standard formula for that?
I don't know what that has to do with it. I meant is the a formula for (sin x cos y)^2 = (sin x)^2 (cos y)^2?
Originally Posted by Stuck Man I don't know what that has to do with it. I meant is the a formula for (sin x cos y)^2 = (sin x)^2 (cos y)^2? It is not a formula. Its one of the exponents' laws.
Thanks.
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