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posted by PLEASE HELP!!! on Thursday, November 12, 2009 at 7:52pm.

how do you do sinAcosA=cosA-cos^3A/sinA

divide each term by cosA sinA = 1 - cos^2A/sinA multiply each term by sinA sin^2A = sinA - cos^2A sin^2A = sinA - (1 - sin^2A) 1 = sinA A = 90º or pi/2 radians or in general: A = k(90)º or k(pi/2) radians

A = pi/2 + 2 n pi radians. n is any integer, including zero

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