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Trigonometric Ratio(sin,cos,tan)

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How to calculate the value of sin18

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Value of sin 18

Q. The value of

\frac{s i n 18 °}{c o s 72 °}

sin 18

cos 18

without using trigonometric table.

Q. The value of

sin 78^{\circ} - sin 18 + cos 132^{\circ}

What is the value of sin 18 degree.

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