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In a right triangle the two acute angles add up to 90∘. This means that the cosine of one angle is the sine of the other. So Y+Y+20=90,2Y=70,Y=35∘. There are other solutions but both the angles will not be acute.
Find the point on the line y=5x+3 that is closet to the origin.
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Suppose that you are headed toward a plateau 50 meters high. If the angle of elevation to the top of the plateau is 60∘, how far are you from the base of the plateau?
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