If `x/y = cosA/cosB` then `(x tanA+ y tanB)/(x+y) = `

if (x)/(y)=(cosA)/(cosB) then prove that (x tan A+y tan B)/(x+y)=tan""(A+B)/(2)

if (x)/(2)=(cosA)/(cosB) then prove that (x tan A+y tan B)/(x+y)=tan""(A+B)/(2)

if (x)/(2)=(cosA)/(cosB) then prove that (x tan A+y tan B)/(x+y)=tan""(A+B)/(2)

"If" tanA =(1-cosB)/(sinB), "then "tan2A =tanB

"If" tanA =(1-cosB)/(sinB), "then "tan2A =tanB

"If" tanA =(1-cosB)/(sinB), "then "tan2A =tanB

If tanA=(1-cosB)/(sinB) , then tan2A=tanB .

If x = cosecA + cosA and y = cosecA - cosA, then find the value of (2/(x+y))^2 +((x-y)/2)^2 -1 . यदि x = cosecA + cosA और y =cosecA - cosA, तो (2/(x+y))^2 +((x-y)/2)^2 -1 का मान ज्ञात करें:

If cos y = x cos (a+y) Then prove that (dy)/(dx) = (cos^(2) (a+y))/(sin a ) , cosa ne +-1