Writing to Learn In the figure for Exercises 7174, t is an
Chapter 4, Problem 4.1.1.257(choose chapter or problem)
Writing to Learn In the figure for Exercises 71–74, t is an angle with radian measure \(0<t<\pi / 2\). Draw a similar figure for an angle with radian measure \(\pi / 2<t<\pi\) and use it to explain why \(\sin (t+\pi / 2)=\cos t\).
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