SOLUTION: sin75 degree=?

Question 151157: sin75 degree=?
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
Start with the given expression.

Rewrite 75 as 45+30. Take note that 45 and 30 are angles found on the unit circle.

Expand the expression using the Sum-Difference identity

Evaluate to get . Evaluate to get . Evaluate to get . Evaluate to get

Multiply

Add the fractions.

So
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