Question

ii) 3 sin2 45° + 2 cos2 60°​

Answer 1

=3 sin90 + 2 cos 120

=3*1 + 2 cos(90+30)

=3+2*-sin30

=3+2×(-1/2)

=3-1

=2

Answer 2

Answer:

3 sin² 45° + 2 cos² 60°

⇒3×(1/√2)² + 2×(1/2)²

⇒3/2 + 2/4

⇒3/2 + 1/2

⇒4/2

⇒2