Question

if sin P + sinQ=a and cosP + cosQ=b , find tan (P-Q)/2

Answer 1

Given, sin P + sin ? = a  .... (1)

and cos P + sin ? = b  .... (2)

On applying (1)2 + (2)2, we will get


$\huge{ ⟹ } \: \mathsf{sin P + sinQ=a and cosP + cosQ=b \: = \: (P-Q)/2}$

Answer 2

Tan(a-b)= ( tan a - tan b)/(1+ tan a tan b ) ... ( sinq/cosq)[cosq]/cos(p+q) cosp ... Ask your own and get expert help! Ask ... If cosx=2/3 abd x is in quadrant 4 find ...