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OpenStudy (anonymous):
Which of the following are trigonometric identities? Check all that apply. A. 4cosxsinx=cosx+-sinx B. cscx-sinx/cscx=cos^2x C. tanxcosxcscx=1 D. 1+cotxtany=sin(x+y)/sinxcosy
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OpenStudy (cwrw238):
C tanxcosxcscx = tanx * cosx * 1 / sinx = tanx * cotx = tanx / tanx = 1 this is an identity
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