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    Comrade Dog
    Jun 03, 2018

    Trig 2 Question

    in AP Calculus Forum

    Hi Mr. G. So I'm still just a little confused here with "express () as trig function of angle x" questions. For example,

    sin(pi + x) = -sinx

    cos(pi/2 + x) = -sinx


    I understand using the equivalent expression rules to solve these. What I'm confused about is what dictates the sign (+ or -). For example in the cos(pi/2 + x) problem, the terminal arm is in quadrant 2, so sin is positive in that quadrant. Yet still the answer is -sinx. Is it the original cosine part of the problem that dictates the CAST?

    2 comments
    Mr. Gesjorskyj
    Jun 04, 2018


    Comrade Dog
    Jun 04, 2018

    Thanks. That makes much more sense

    2 comments