[中學] inverse function

[ayakashen (ShenA)]

1. f(x)=3sin(4x), find the inverse function of f(x).

2. Simplify the expression. tan(cos^(-1)(x/3))
***cos^(-1)(x/3)---> inverse of cos(x/3)


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推 jacky7987   :1. arcsin(x/3)/4   2.畫圖