What is the Cartesian form of $(- 3, \frac{- 7 π}{8})$ $(-3,(-7pi)/8)$ ?

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Answer 1 · 2017-09-23T16:19:47

$(- 2.99655, 0.14388)$ $(-2.99655, 0.14388)$

For x :

$x = r cos θ$ $x = r cos theta$
$x = (- 3) \cdot cos (\frac{- 7 π}{8})$ $x = (-3)* cos((-7pi)/8)$
$x = - 2.996547938385$ $x = -2.996547938385$

For y :

$y = r sin θ$ $y = r sintheta$
$y = (- 3) \cdot sin (\frac{- 7 π}{8})$ $y = (-3)* sin((-7pi)/8)$
$y = 0.143876519814$ $y = 0.143876519814$

The answer is (Rounded off) $\to (- 2.99655, 0.14388)$ $-> (-2.99655, 0.14388)$

This is the graph....

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What is the Cartesian form of (-3,(-7pi)/8)(−3,−7π8)(-3,(-7pi)/8)?