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OpenStudy (anonymous):
1+cos(12x) = ____ a. 2sin^2(12x) b. 2cos^2(6x) c. 2sin^2(6x) d. 2cos^2(12x)
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OpenStudy (raden):
b
OpenStudy (anonymous):
why is it b??
OpenStudy (raden):
look the folowing identity : cos^2 x = (1+cos2x)/2 or 1+cos2x = 2*cos^2 x now, if u convert "x" be "6x", it will be 1+cos2(6x) = 2*cos^2 6x, right ? it similar with 1+cos12x = 2*cos^2 6x
OpenStudy (raden):
r u there @Spectrum
OpenStudy (anonymous):
yeah ..ty
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