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## Homework Statement

Sketch y = cos-1(2x) and y = sin-1(3x)

## Homework Equations

## The Attempt at a Solution

This is my attempt

cos-1(2x) = y, which means cos y = 2x

produce a table with y from (-pi/2 to pi/2)

What I want to confirm is the 2x. I need do 1/2 x instead of 2x when we calculate the x?

And 1/3x for the other problem?