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JEEMAIN and NEET
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Trigonometry
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The value of $\cos(45^{\circ}-A)\cos(45^{\circ}-B)-\sin(45^{\circ}-A)\sin(45^{\circ}-B)$ is equal to
$\begin{array}{1 1}(a)\;\sin(A+B)&(b)\;\cos(A+B)\\(c)\;\sin(A-B)&(d)\;\cos(A-B)\end{array}$
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