Question

evaluate cos 30 ° cos 45°- sin 30 ° sin45 °​

Answer 1

Answer:

Step-by-step explanation:

Answer 2

Answer:

$\cos(30) \times \cos(45) - \sin(30) \times \sin(45) \\ \frac{ \sqrt{3} }{2} \times \frac{1}{ \sqrt{2} } - \frac{1}{2} \times \frac{1}{ \sqrt{2} } \\ \frac{ \sqrt{3} }{2 \sqrt{2} } - \frac{1}{2 \sqrt{2} }$