$\"\"$

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Observe the diagram.

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The length of opposite side to $\"\"$ is $\"\"$ .

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The length of adjacent side to $\"\"$ is $\"\"$ .

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Acute angle is $\"\"$ .

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The trigonometric function : $\"\"$ .

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$\"\"$ .

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$\"\"$

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Find value of $\"\"$ .

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If one angle is $\"\"$ , then we can get other angle by subtracting given angle from $\"\"$ .

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The second angle is $\"\"$ .

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In right angle triangle the angles are $\"\"$ , $\"\"$ , and $\"\"$ then the sides are $\"\"$ , $\"\"$ and $\"\"$ .

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Draw diagram using above information.

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$\"\"$

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$\"\"$

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Substitute $\"\"$ in equation (1).

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$\"\"$

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$\"\"$

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The value of $\"\"$ is $\"\"$ . $\"\"$

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The value of $\"\"$ is $\"\"$ .