Step :1

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The trigonometric values are $\"\"$ .

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Find $\"\"$

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Let $\"\"$ .

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The trigonometric difference formula is $\"\"$ .

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Substitute $\"\"$ and $\"\"$ in the trigonometric formula.

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$\"\"$

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By using trigonometric table values.

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$\"\"$

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$\"\"$ .

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Step :2

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Find $\"\"$

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Let $\"\"$ .

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The trigonometric difference formula is $\"\"$ .

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Substitute $\"\"$ and $\"\"$ in the trigonometric formula.

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$\"\"$

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By using trigonometric table values.

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$\"\"$

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$\"\"$ .

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Step :3

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Find $\"\"$

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$\"\"$

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$\"\"$ .

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The exact values of trigonometric identities are $\"\"$ , $\"\"$ and $\"\"$ .

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Solution :

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The exact values of trigonometric identities are $\"\"$ , $\"\"$ and $\"\"$ .