When cosx=0, what does x equal?

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When cosx=0, what does x equal?

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Answer 1 · 2016-05-15T13:45:51

$90^o$

Explanation:

$x=$ $cos^-1(0)$ = $90^o$

Using the cosine graph,

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$x$ could also $= 270^o, 450^o, 810^o, -90^o, -270^o, -450^o, -810^o$ etc.

Answer 2 · 2016-05-15T18:02:40

$+- pi/2$

Explanation:

Trig unit circle -->
cos x = 0 --> arc $x = +- pi/2$
For period (0, 2pi), the answers are:
$pi/2 and (3pi)/2$
Note. The arc - $(pi/2)$ is co-terminal to the arc $(3pi)/2$

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When cosx=0, what does x equal?

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