- #1

sxyqwerty

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## Homework Statement

Let R be the triangle defined by -xtanα≤y≤xtanα and x≤1 where α is an acute angle sketch the triangle and calculate

∫∫

_{R}(x

^{2}+y

^{2})dA using polar coordinates

hint: the substitution u=tanθ may help you evaluate the integral

## Homework Equations

## The Attempt at a Solution

so the triangle has points (0,0) (1, xtanα) (1, -xtanα)

and r=1/cosα=secα

and I am stuck from here i don't know how to find the θ value of the polar coordinate