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Olympiad-Math
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Class 10
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Q)
The value of $\sin (70^{\circ}+ \theta) - \cos (20^{\circ}- \theta )$=________
$\begin{array}{1 1}(A) \; 0 \\(B)\; 1 \\(C)\;-1 \\(D)\;\pm 1 \end{array}$
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