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જ્યારે $A = \frac{5\pi}{4}$ હોય ત્યારે $\cos A - \sin A$ ની કિંમત શું થાય?

જો $\frac{\cos A}{3} = \frac{\cos B}{4} = \frac{1}{5}$, $-\frac{\pi}{2} < A < 0$, અને $-\frac{\pi}{2} < B < 0$ હોય, તો $2 \sin A + 4 \sin B$ ની કિંમત શોધો.

$\sin 15^\circ + \cos 105^\circ = $

$f(x) = \cos (x/3)$ નો વિસ્તાર (range) શું છે?

જો $\cos(\alpha + \beta) = 0$ હોય,તો $\sin(\alpha + 2\beta) =$

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