$\"\"$

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(a)

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The equation is $\"\"$ and the value of $\"\"$ .

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Consider $\"\"$ .

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Substitute $\"\"$ in $\"\"$ . \ \

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$\"\"$

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$\"\"$

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$\"\"$ .

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Thus, the value of $\"\"$ is a solution of $\"\"$ .

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$\"\"$

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(b)

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The equation is $\"\"$ and the value of $\"\"$ .

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Consider $\"\"$ .

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Substitute $\"\"$ in $\"\"$ . \ \

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$\"\"$ \ \

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$\"\"$

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Since the angle $\"\"$ lies in the fourth quadrant, secant function is positive and even.

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$\"\"$

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$\"\"$

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$\"\"$ .

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Thus, the value of $\"\"$ is a solution of $\"\"$ .

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$\"\"$

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(a) The value of $\"\"$ is a solution of $\"\"$ .

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(b) The value of $\"\"$ is a solution of $\"\"$ .