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Questions  >>  Olympiad-Math  >>  Class 9
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Q)

If $\sin \theta + \cos \theta =1 $ then $\cos \theta - \sin \theta=$______

$\begin{array}{1 1}(A) \; 1 \\(B)\; -1 \\(C)\;0 \\(D)\;\pm 1 \end{array}$

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