given that sin (a + b) is equal to sin a cos b + cos a sin b find the value of sin 75
Answers
Answered by
1
Step-by-step explanation:
sin 75° = sin ( 45° + 30° )
= sin 45° cos 30° + cos 45° sin 30°
= 1/root 2 . root 3/2 + 1/root 2 . root 3/2
= root 3/2 root 2 + root 3/2 root 2
= ( root 3 + root 3 )/2 root 2
= 2 root 3/2 root 2
= root 3/root 2...
Answered by
1
Answer:
sin(30°+45°) =sin 30°.cos45°+cos30°sin45°
=1/2×1/√2+√3/2×1/√2
=(1+√3) /2√2
Similar questions