trig

I have heard that trig CAN be super easy, that there are just, like, 10 rules you need to memorize then all the problems are easy.

... Does anyone know what these are?

Thanks!

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  1. I would say they are the definitions of tan, cot, sec and csc in terms of sin and cos,
    tan = sin/cos
    cot = cos/sin
    csc = 1/sin
    sec = 1/cos


    sin^2 + cos^2 = 1

    the law of sines

    the law of cosines

    sin (a + b) = sin a cos b + cos b sin a

    cos (a + b) = cos a cos b - sina sin b

    tan (a + b) =
    (tan a + tan b)/[1 -(tan a tan b)]

    Others may differ

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    posted by drwls

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