Question

formula of Trigonometry​

Answer 1

Step-by-step explanation:

this one is answer of that que

Answer 2

Trigonometric formulae:

sin C + sin D = 2 Sin (C + D)/2 cos (C - D)/2

sin C - sin D = 2 cos (C + D)/2 sin (C - D)/2

cos C + cos D = 2 cos (C + D)/2 cos (C - D)/2

cos D + cos C = 2 sin (C + D)/2 sin (C - D)/2