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Standard Values of Trigonometric Ratios

What is the v...

Question

What is the value of Sin42•

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Solution

Value of Sin(42 degree) = 0.66913061

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Q. The value of

sin 78^{\circ} - sin 66^{\circ} - sin 42^{\circ} + sin 6^{\circ}

Q. Find the value :

sin 78^{\circ} - sin 18^{\circ} + sin 30^{\circ} - sin 42^{\circ}

Q. The value of sin 78° − sin 66° − sin 42° + sin 60° is
(a)

\frac{1}{2}

- \frac{1}{2}

(c) −1

(d) None of these

c o s 48^{\circ} - s i n 42^{\circ} =

Evaluate :
$cos 48^{\circ} - sin 42^{\circ}$ ___

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