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Let theta, varphi epsilon [0,2pi] be suc...

Let `theta, varphi epsilon [0,2pi]` be such that `2 cos theta(1-sin varphi)= sin^2 theta(tan theta/2+cot theta/2)cos varphi-1, tan(2pi-theta)>0` and `-1> sin theta < sqrt3 /2`

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