Question

please solve this......

Answer 1

Answer:

3 / 2

Step-by-step explanation:

In radians, π = 180°

Thus,

π / 6 = 180 / 6 = 30°

π / 4 = 180 / 4 = 45°

π / 3 = 180 / 3 = 60°

Hence, answer:

cos ^2 30° + cos ^2 45° + cos ^2 60°

= ( √3 / 2 ) ^2 + ( 1 / √2 ) ^2 + ( 1 / 2 ) ^2

= 3 / 4 + 1 / 2 + 1 / 4

= ( 3 + 2 + 1 ) / 4

= 6 / 4

= 3 / 2