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OpenStudy (anonymous):
what is sin^2(x)-cos^2(x) equal to?
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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 \(\cos(2x)\)
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OpenStudy (anonymous):
its an identity we learn at school
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