Question

evaluate cos 45 degree cos 30 degree + sin 45 degree sin 30 degree

Answer 1

your answer

given:-

› cos45°×cos30°+sin45°×sin30°

now

› cos45°=1/2
› cos30°=1/√2
› sin45°=1/√2
› sin30°=1/2

put values

» 1/√2×1/2+1/√2×1/2

[lcm will be 2/√2]

» 1+1/2√2=2/2√2=1/√2

» Answer=1/√2

hope helps

@AnanyaR☺

Answer 2

Same..............................