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Mathematics 18 Online
OpenStudy (anonymous):

what is sin^2(x)-cos^2(x) equal to?

OpenStudy (anonymous):

look up the "double angle" formula for sine

OpenStudy (anonymous):

cos2x

OpenStudy (anonymous):

cool thanks satellite 73. why do those work?

OpenStudy (anonymous):

"why" is a good question it takes some work to prove any of these

OpenStudy (anonymous):

btw @physicsboffin is correct, it is \(\cos(2x)\)

OpenStudy (anonymous):

its an identity we learn at school

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