cos left(frac{3 pi}{4}+xright)-sin left(frac{ | vedclass

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(A) We use the trigonometric identities: $\cos(A+B) = \cos A \cos B - \sin A \sin B$ and $\sin(A-B) = \sin A \cos B - \cos A \sin B$.$\cos \left(\frac

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$-\sqrt{2} \cos x$

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(A) We use the trigonometric identities: $\cos(A+B) = \cos A \cos B - \sin A \sin B$ and $\sin(A-B) = \sin A \cos B - \cos A \sin B$.$\cos \left(\frac{3 \pi}{4}+x\right)-\sin \left(\frac{\pi}{4}-x\right)$$= \left(\cos \frac{3 \pi}{4} \cos x - \sin \frac{3 \pi}{4} \sin x\right) - \left(\sin \frac{\pi}{4} \cos x - \cos \frac{\pi}{4} \sin x\right)$Since $\cos \frac{3 \pi}{4} = -\frac{1}{\sqrt{2}}$,$\sin \frac{3 \pi}{4} = \frac{1}{\sqrt{2}}$,$\sin \frac{\pi}{4} = \frac{1}{\sqrt{2}}$,and $\cos \frac{\pi}{4} = \frac{1}{\sqrt{2}}$:$= \left(-\frac{1}{\sqrt{2}} \cos x - \frac{1}{\sqrt{2}} \sin x\right) - \left(\frac{1}{\sqrt{2}} \cos x - \frac{1}{\sqrt{2}} \sin x\right)$$= -\frac{1}{\sqrt{2}} \cos x - \frac{1}{\sqrt{2}} \sin x - \frac{1}{\sqrt{2}} \cos x + \frac{1}{\sqrt{2}} \sin x$$= -\frac{2}{\sqrt{2}} \cos x = -\sqrt{2} \cos x$.

$\cos \left(\frac{3 \pi}{4}+x\right)-\sin \left(\frac{\pi}{4}-x\right) = $

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