What is the value of cos 90 degrees?

C. 0 — The cosine function represents the x-coordinate on the unit circle. At 90 degrees, the point on the unit circle is (0, 1), so the cosine value is 0.

JEE Main · MathematicsEasy

$cos (9 0^{\circ})$

A. $1$
B. $1/2$
C. $0$
D. $- 1$

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Correct answer: C — $0$

Solution

On the unit circle, the coordinates at 9 0^{\circ} are (0, 1) . The cosine value corresponds to the x-coordinate, which is 0 .

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cos(90∘)

Solution

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$cos (9 0^{\circ})$