" If "cos x+cos y=(4)/(5)" and "cos x-cos y=(2)/(7)," find the value of "14tan(x-y)/(2)+5cot(x+y)/(2)

If cos x+ cosy =(4)/(5) and cos x- cos y =(2)/(7) , then the value of 14 tan ((x-y)/(2)) +5 cot ((x+y) /2)

cos x + cos y = (4) / (5), cos x-cos y = (2) / (7) rArr14tan ((xy) / (2)) + 5cot ((x + y) / (2)) =

cos x + cos y = (4) / (5), cos x-cos y = (2) / (7) rArr14tan ((xy) / (2)) + cot ((x + y) / (2)) =

If sin x + sin y =a and cos x+cos y = b , find the values of : tan frac (x-y)(2) .

If sin x + sin y =a and cos x+cos y = b , find the values of : tan frac (x+y)(2) .

If sin x+"sin" y=a and cos x+cos y=b , find the values of: (i) "tan""(x+y)/(2) (ii) "tan""(x-y)/(2) .

If cos x + cos y = 2, "then the value of" sin(x + y) is-

If cos x = k cos (x - 2y), then the value of tan (x -y).tan y is