The expression is .
(Apply Trigonometric identity)
(Subtract from each side)
(Simplify)
(Substitute )
(Evaluate power: )
(Subtract: )
(Take the square root of each side)
(Simplify)
is in the second quadrant, cos is negative,
Therefore .
To find tan.
(Substitute and )
(Cancel common terms)
(Multiply numerator and denominator by )
(Multiply)
The value of .
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