Question

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Answer 1

\[\tan(A+B) = \frac{\tan A + \tan B}{1- \tan A \tan B}\]

Answer 2

Find Tan A by using the properties
\[\cos A = \sqrt{1- \sin^2 A}\]
\[\tan A = \frac{\sin A}{\cos A}\]

Answer 3

It'd be a lot easier for others to give you relevant feedback if you'd please show your own work.