How do you find the value of $cos (- 90)$ $cos (-90)$ ?

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How do you find the value of $cos (- 90)$ $cos (-90)$ ?

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Answer 1 · 2018-04-18T09:15:30

$cos - θ = cos (360 - θ) = cos θ since cos is +ve in IV Quadrant$ $cos- theta = cos (360 - theta) = cos theta color(maroon)(" since cos is +ve in IV Quadrant"$

$:. cos (-90) = cos (360 - 90) = cos 90 = 0$

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How do you find the value of $cos (- 90)$ $cos (-90)$ ?

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How do you find the value of $cos (- 90)$ $cos (-90)$ ?