$\"\"$

d) $\"italic$

The difference formula for the tangent function: $\"italic$ . $\"italic$ (Apply quotient identity: $\"italic$ )

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

$\"equal$ $\"\"$

Substitute $\"italic$

The value are available in problem no 33a.

$\"equal$ (Simplify)

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

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