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Find the value of sin 15^@ ....

Find the value of
sin `15^@` .

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(L.H.S) . =3 sin (pi)/(6) sec (pi)/(3)-4 sin (5 pi)/(6) cot (pi)/(4) =3 xx (1)/(.2) xx 2-4 sin (pi-(pi)/(6)) xx 1=3-4 sin (pi)/(6) =3-4 xx (1)/(2)=1=(R) . (H.S) . .
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