Question

Evaluate the following questions:
(a) cos 30º cos 45º -sin 30° sin 45°​

Answer 1

Answer:

√3/8

=√3/2 1/√2- 1/2. 1/√2

=√3/2×2(√2-√2/)

=√3/4×2

=√3/8

Answer 2

Answer:

cos 30°cos 45° - sin 30° sin 45°

$\frac{\sqrt[2]{3} }{2} *\frac{1}{\sqrt{2} } - \frac{1}{2} *\frac{1}{\sqrt{2} } \\\frac{1}{2\sqrt{2} }(\sqrt{3} -1 )$

Step-by-step explanation: