Question

sin47+sin61-sin11-sin25is = to

Answer 1

sin47 - sin25) + (sin61 - sin11)

(2cos36 x sin11) + (2cos36 x sin25)

2cos36 ( sin11 + sin25)

4cos36 x sin18 x cos7

sin18 = (root5 - 1)/4 and cos36 = (root5 + 1)/4

so on solving we get, cos7.

Answer 2

here is your answer and mark as branilest