$\"\"$

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In a right angle triangle, the angles are in the ratio $\"\"$ then the sides are in the ratio $\"\"$ .

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Draw diagram using above information.

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$\"\"$

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Trigonometric function : $\"\"$ .

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$\"\"$

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In a right angle triangle, the angles are in the ratio $\"\"$ then the sides are in the ratio $\"\"$ .

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Draw diagram using above information.

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$\"\"$

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Trigonometric function : $\"\"$ .

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$\"\"$

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From equation (1) and (2),

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$\"\"$ .

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$\"\"$

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$\"\"$ .