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$ \sin \left(45^{\circ}+\theta\right)-\cos \left(45^{\circ}-\theta\right) $ is equal to
(A) $ 2 \cos \theta $
(B) 0
(C) $ 2 \sin \theta $
(D) 1
Given:
\( \sin \left(45^{\circ}+\theta\right)-\cos \left(45^{\circ}-\theta\right) \)
To do:
We have to find the value of \( \sin \left(45^{\circ}+\theta\right)-\cos \left(45^{\circ}-\theta\right) \).
Solution:
We know that,
$\cos(90^o - \theta) = \sin \theta$
Therefore,
$\sin (45^{\circ}+\theta)-\cos (45^{\circ}-\theta)= \cos[90^o- (45^o + \theta)] - \cos(45^o- \theta)$
$= \cos (45^o - \theta) - \cos (45^o - \theta)$
$= 0$
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