Why is cos (150⁰) not the same as cos (30⁰) ?

Is this because of the sign values of the cos. trig function that makes it negative in the 2nd quadrant?

Question

Mathematics

Leonel Wyatt

27 October, 21:44

Why is cos (150⁰) not the same as cos (30⁰) ?

Is this because of the sign values of the cos. trig function that makes it negative in the 2nd quadrant?

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Answers (1)

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Magdalena Page · Answer 1

Yeah, cos 150° is negative because it's in the 2nd quadrant, which has all negative x-values. (The third quadrant has all negative x-values as well)

Cos 30° is positive because the first quadrant (and 4th) have all positive x-values.

Why is cos (150⁰) not the same as cos (30⁰) ?Is this because of the sign values of the cos. trig function that makes it negative in the 2nd quadrant?

Why is cos (150⁰) not the same as cos (30⁰) ?

Is this because of the sign values of the cos. trig function that makes it negative in the 2nd quadrant?