Question

2) Cos 60'x Cos 30° + Sin 60" Sin 30'
3) 2 Sin 30° + Cos 0 + 3sin 90°
4) Cos? 45° + Sin' 30°​

Answer 1

Step-by-step explanation:

2. cos 60° = 1/2

cos 30° = √3/2

sin 60° = √3/2

sin 30° = 1/2

= cos 60° ×cos 30° +sin 60° sin 30°

= 1/2 × √3/2 + √3/2 × 1/2

=√3/4 + √3/4

= √6/4

3. 2 sin 30° + cos 0° + 3 sin 90°

=2×1/2 + 1 + 3×1

=1+1+3

=5