By the angle difference formula for sines, we have:

By the angle sum formula for tangents, we have:

.
Rationalizing the denominator gives

as the final answer.
2a) 30
2 x 15
3 x 5
30=2x3x5
2b) 60
6 x 10
2x3 2x5
60=2x3x2x5
Answer:
Step-by-step explanation: