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...Section solving trigonometric equations when simple of the form trig ratio number e g sin here s a reasonable approach use inverse function to find solution th determine if second exists and so above is quadrant knowledge it angle sine also negative in rd there include periodic solutions period full or where k any integer some have nonstandard periods example solve tan this tangent has functions only one per we dividing by for more complicated algebra identities isolate ratios then that result cos sincos common factor out product equal set each nd on equation finish problem these...