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

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 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 sinA=1/sqrt2, cosB=sqrt3/2 then (tanA+tanB)/(1-tanAtanB)=

If (cosA)/(cosB)=(x)/(y) , where A!=B , then

If 2 cos A=x+1/x, 2 cosB=y+1/y then show that 2 cos(A-B)=x/y + y/x .

If cos(A - B) = (3)/(5) and tanA tanB = 2, then the value of cosA cosB is _____

If cosA=tanB,cosB=tanCand cosC=tanA, Show that sinA=sinB=sinC=2*sin18^o