\

sin u= 7/25, pi/2 is less than or equal to u is less than or equal to pi

\

Step 1:

\

The trigonometric function is $\"\"$

\

Since $\"image\"$ lies in quadrant II then $\"image\"$ is also lies in quadrant II.

\

Thytogarean theorem,

\

$\"\"$ \ \

\

Find $\"image\"$ .

\

Using half - angles formulas : $\"image\"$ .

\

Substitute $\"\"$ in above formula.

\

$\"\"$ .

\

Step 2:

\

Find $\"image\"$ .

\

Using half - angles formulas : $\"image\"$ .

\

Substitute $\"\"$ in above formula.

\

$\"\"$

\

Step 2:

\

Find $\"image\"$ .

\

Using half - angles formulas : $\"image\"$ .

\

Substitute $\"\"$ in above formula.

\

$\"\"$

\

Solution :

\

$\"\"$

\