Question

Please help this 2 sums

Answer 1

Explanation:

Sin (A + B) = Sin A *Cos B + Cos A *Sin B

Sin 75 = Sin (30 + 45)

= Sin 30 * Cos 45 + Cos 30 * Sin 45

`= (1)/(2)*(1)/(√(2))+(√(3))/(2)*(1)/(√(2))\\\\\\= (1)/(2√(2))+(√(3))/(2√(2))\\\\= (1+√(3))/(2√(2))`