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$\cos A + \sin (270^\circ + A) - \sin (270^\circ - A) + \cos (180^\circ + A) = $

Which of the following have the same value?
$(a)$ $\sin 120^{\circ}$
$(b)$ $\cos 930^{\circ}$
$(c)$ $\tan 840^{\circ}$
$(d)$ $\cot (-1110^{\circ})$

$1+\cot ^2 30^{\circ}-\sec ^2 45^{\circ}=$

Find the values of the other five trigonometric functions if $\sin x = \frac{3}{5}$ and $x$ lies in the second quadrant.

If $\tan \theta = -\frac{4}{3},$ then $\sin \theta = $

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