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Trig question
sin(360 - x) = -sin x [because sin is negative in the 4th quadrant] tan(90 - x) = cos x [positive because tan is positive in the 1st quadrant and cotx = 1/tanx] Putting it together: sin(360 - x) * tan(90 - x) = (-sin x) * cot x = -sinx * (cosx / sinx) [ because cotx = cosx / sinx] = -cosx- jennduong
- Post #4
- Forum: Mathematics Advanced
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