Question

please can u evaluate this expression:sin 70 - sin 10

Answer 1

Step-by-step explanation:

Use The Formula :

Sin(A) - Sin(B) = 2Sin(A-B)/2 Cos(A+B)/2

regarding this

sin70 - sin10 = 2sin(30) cos(40)

= cos(40) = sin(50)

Answer 2

Answer:

Step-by-step explanation:

Using the formula-:

$sin A -sinB = 2cos(a+b/2)sin(a-b/2)$

sin 70 - sin 10 = 2cos(70+10/2)sin(70-10/2)

                       = 2cos(40)sin(30)