How do you convert the polar coordinate $(-2,(7pi)/8)$ into rectangular coordinates?

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Answer 1 · 2018-04-27T08:00:28

$(1.84,-0.77)$

Given $(r,theta)$ , $(x,y)$ can be found by doing $(rcostheta,rsintheta)$

$r=-2$
$theta=(7pi)/8$

$(x,y)->(-2cos((7pi)/8),-2sin((7pi)/8)~~(1.84,-0.77)$

How do you convert the polar coordinate (-2,(7pi)/8)(-2,(7pi)/8) into rectangular coordinates?