Question

given that sin (a + b) is equal to sin a cos b + cos a sin b find the value of sin 75​

Answer 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...

Answer 2

Answer:

sin(30°+45°) =sin 30°.cos45°+cos30°sin45°

=1/2×1/√2+√3/2×1/√2

=(1+√3) /2√2