Step 1:

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The trigonometric equation is $\"\"$ .

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$\"\"$ .

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Apply squaring on each side.

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$\"\"$

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Pythogorean identity: $\"\"$ .

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$\"\"$

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$\"\"$ and $\"\"$ .

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$\"\"$ and $\"\"$ .

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$\"\"$ and $\"\"$ .

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$\"\"$ and $\"\"$ .

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General solution of $\"\"$ are $\"\"$ and $\"\"$ .

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Therefore general solution of $\"\"$ is

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$\"\"$ .

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Thus, Option (c) is correct.

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(2)

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The trigonometric equation is $\"\"$ .

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$\"\"$ .

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Apply squaring on each side.

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$\"\"$

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Pythogorean identity: $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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General solution of $\"\"$ are $\"\"$ and $\"\"$ .

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Therefore general solution of $\"\"$ is $\"\"$ .

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Thus, Option (d) is correct.

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(2)

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