Question

Prove that cos45° cos60° + sin45° sin60° =
$\frac{ \sqrt{3} + 1 }{2 \sqrt{2} } =$
​

Answer 1

Answer:

cos45° cos60° + sin45° sin60°

1 /√2 × 1 /2 + 1 /√2 × √3 /2

1 /2√2 + √3 /2/√2

√3+1 / 2√2