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(Solved): How to do this question? (1) \( \sin \left(180^{\circ}+A\right) \tan \left(270^{\circ}-A\right)+\co ...
How to do this question? (1) \( \sin \left(180^{\circ}+A\right) \tan \left(270^{\circ}-A\right)+\cos \left(90^{\circ}+A\right) \operatorname{cosec}\left(360^{\circ}-A\right)= \) ? (2) \( \frac{\sec \left(-900^{\circ}\right)+\sin 870^{\circ} \tan \left(-210^{\circ}\right)}{\cos 390^{\circ}}= \) ?
Expert Answer
(1) To solve the given trigonometric equation sin?(180°+A)tan?(270°?A) +cos?(90°+A)cos?ec(360°?A) .........(1) We know that sin?(180°+A)=?sin?(A) , si