Yefim S. answered • 11/26/21
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(1 - cosθ)/(1 + cosθ) = 2sin2(θ/2)/(2cos2(θ/2)) = tan2((θ/2)
Ifeoma R.
asked • 11/26/21Show that 1-costheta/1+costheta=tan^2 1/1 theta
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