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(1−cos2θ)cscθ = 1\left(1-\cos^2\theta\right)\csc\theta\ =\ 1(1−cos2θ)cscθ = 1
True
False
True or False: cos 48º=cos18ºcos30º+sin18ºsin30º\cos\ 48º=\cos18º\cos30º+\sin18º\sin30ºcos 48º=cos18ºcos30º+sin18ºsin30º
True or False: cos(−12º)=−cos12º\cos\left(-12º\right)=-\cos12ºcos(−12º)=−cos12º
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