Step 1:

\

(a)

\

The equation is $\"\"$ .

\

$\"\"$

\

The general solution of sine function is $\"\"$ .

\

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

\

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

\

$\"\"$

\

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

\

$\"\"$

\

$\"\"$

\

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

\

$\"\"$

\

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

\

Step 2:

\

The equation is $\"\"$ .

\

$\"\"$

\

The general solution of sin function is $\"\"$ .

\

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

\

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

\

$\"\"$

\

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

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

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

\

(b)

\

The equation is $\"\"$ .

\

$\"\"$

\

The general solution of sine function is $\"\"$ .

\

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

\

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

\

$\"\"$

\

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

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

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

\

$\"\"$

\

Substitute $\"\"$ in the above expression

\

$\"\"$

\

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

\

$\"\"$

\

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

\

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

\

Step 2:

\

The equation is $\"\"$ .

\

$\"\"$

\

The general solution of sin function is $\"\"$ .

\

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

\

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

\

$\"\"$

\

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

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

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

\

$\"\"$

\

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

\

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

\

Solution:

\

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

\

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