What is the Cartesian form of $(-2,(81pi) /16)$ ?

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Answer 1 · 2017-04-29T16:47:21

$~~(1.96, 0.39)$

Given: $(-2, (81 pi)/16) = (r, theta)$

To convert to Cartesian form $(r cos theta, r sin theta)$

When using your calculator, make sure MODE = radians

$-2 cos (81 pi)/16 ~~ 1.961570561$

$-2 sin (8a pi)/16 ~~ .390180644$

$~~(1.96, 0.39)$

What is the Cartesian form of (-2,(81pi) /16)(-2,(81pi) /16)?