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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asked Mar 15, 2019 145k views

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DaveU · Answer 1 · 2019-03-19T11:11:38+0000

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?

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