Description
cosθ=2/5, tan θ<0 Find sin θ.
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Explanation & Answer
cos theta = 2/5
sin theta = sqrt(1-cos theta^2)
sin theta = sqrt( 1-4/25) = sqrt(21/25) = sqrt(21)/5= ±0.916515
Since tan theta < 0, sin theta = -0.916515 = -0.92
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