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Magazine Problem 73
Draw \(45^{\circ}\) and \(-45^{\circ}\) in standard position and then show that \(\cos \left(-45^{\circ}\right)=\) \(\cos 45^{\circ}\).
Problem 74
Draw \(45^{\circ}\) and \(-45^{\circ}\) in standard position and then show that \(\sin \left(-45^{\circ}\right)=\) \(-\sin 45^{\circ}\)
Problem 87
\(\sin \theta(\sec \theta+\csc \theta)=\tan \theta+1\)
Problem 88
\(\sec \theta(\sin \theta+\cos \theta)=\tan \theta+1\)
