$\"\"$

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(a)

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The equation is $\"\"$ .

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$\"\"$

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The general solution of sine function is $\"\"$ , where $\"\"$ is an integer.

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$\"\"$ where $\"\"$ .

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Substitute $\"\"$ in the above expression.

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$\"\"$

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Conversion from degrees to radians :

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$\"\"$ .

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Substitute $\"\"$ in the above expression.

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$\"\"$

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$\"\"$

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

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$\"\"$

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Conversion from degrees to radians :

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$\"\"$ .

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The solutions of $\"\"$ are $\"\"$ or $\"\"$ radians and $\"\"$ or $\"\"$ radians.

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$\"\"$

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(b)

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The equation is $\"\"$ .

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$\"\"$

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The general solution of sine function is $\"\"$ , where $\"\"$ is an integer.

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$\"\"$ where $\"\"$ .

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Substitute $\"\"$ in the above expression.

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$\"\"$

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Substitute $\"\"$ in the above expression.

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$\"\"$

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$\"\"$

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$\"\"$

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

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$\"\"$

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Substitute $\"\"$ in the above expression.

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$\"\"$

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

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$\"\"$

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The solution of $\"\"$ is not in the interval $\"\"$ .

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The solutions of $\"\"$ are $\"\"$ and $\"\"$ .

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Convert $\"\"$ into radians :

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$\"\"$ .

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Convert $\"\"$ into radians :

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$\"\"$ .

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The solutions of $\"\"$ are $\"\"$ or $\"\"$ radians and $\"\"$ or $\"\"$ radians.

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$\"\"$

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(a) The solutions of $\"\"$ are $\"\"$ or $\"\"$ radians and $\"\"$ or $\"\"$ radians.

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(b) The solutions of $\"\"$ are $\"\"$ or $\"\"$ radians and $\"\"$ or $\"\"$ radians.