$\"\"$

d) $\"italic$

Substitute $\"italic$

The value are available in problem no 33a.

$\"italic$ (Apply quotient identity: $\"italic$ )

$\"italic$ $\"\"$

The difference formula for the tangent function: $\"italic$ .

$\"equal$ \ \

$\"equal$ (Rewrite the expression with common denominator)

$\"equal$ (Simplify) $\"\"$

The value of $\"italic$ $\"equal$ .