Year 12 Methods (Unit 3 & 4) Trigonometric functions

Defining sine, cosine and tangent

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Questions

Question 1

19031

Find the value of \(\cos (\dfrac{{ - 7\pi }}{2})\)

Answer

\(0\)

Worked Solution

\begin{align}
\cos \left(-\frac{7 \pi}{2}\right) &=\cos \left(\frac{7 \pi}{2}\right) \\
&=\cos \left(2 \pi+\frac{3 \pi}{2}\right) \\
&=\cos \left(\frac{3 \pi}{2}\right) \\
&=0
\end{align}

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