cos²150 + cos²30 I do not understand what you are supposed to do with the ² symbol following the tan, cos, sin things.
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Originally Posted by Trentt cos²150 + cos²30 I do not understand what you are supposed to do with the ² symbol following the tan, cos, sin things. cos²150 = cos(150) * cos(150) = -cos(30) * -cos(30) = cos²30 (ie. you are simply squaring the result of the cosine function.) So cos²150 + cos²30 = cos²30 + cos²30 = 2*cos²30 = 2*(sqrt{3}/2)² = 2*(sqrt{3}/2)*(sqrt{3}/2) = 2*(3/4) = 3/2 -Dan
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