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OpenStudy (anonymous):
1 - cos(12x) = 2cos^2(6x) 2sin^2(12x) 2cos^2(12x) 2sin^2(6x)
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hartnn (hartnn):
use the formula \(\large 1-\cos 2A = 2\sin^2A\)
hartnn (hartnn):
here 2A = 12x so, A will be 6x :)
OpenStudy (anonymous):
so its the first one thanks
hartnn (hartnn):
no! its sin^2 ....and half of 12x = 6x so 2sin^2 6x
OpenStudy (anonymous):
oh sin not cos ty
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hartnn (hartnn):
welcome ^_^
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