Cos theta by 1 minus sin theta + cos theta by 1 + sin theta equal to 4 is true
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cos theta/1-sin theta+cos theta/1+sin theta
cos theta (1+sin theta)+cos theta(1-sin theta)/1¹-sin²theta
cos theta+cos theta sin theta +cos theta-sin theta cos theta/1-sin² theta
cos theta+cos theta/cos² theta
2cos theta/cos²theta
2/cos theta=4
cos theta=1/2
theta=60° _____________(as cos 60°=1/2)
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