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Symmetry Properties - Questions

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Question 1
19036

If \(\sin x=0.5\) and \(\cos y=0.7\), then the value of \(\sin (\pi + x) + \cos (\pi - y) = \)

\(-1.2\)

\begin{align}
&\sin (\pi+x)=-0.5,\; \cos (\pi-y)=-0.7 \\
&\therefore \sin (\pi+x)+\cos (\pi-y)=-1.2
\end{align}

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