Question

+cot (211 + x) = 118
+ x)
sin (n + 1x sin:(n + 2)x + cos (n + 1 x cos (n + 2)x = cos x
2
3т​

Answer 1

Step-by-step explanation:

n+1 =A ,n+2=B

sin A * sin B + cos A * cos B= cos X

cos ( A-B) = Cos X

cos X ( (n+2) - (n+1) ) = cos X

so , now get cancel

cos X = cos X