If `(sin x)(sin y)=1`, then `(cos x)(cos y)=?`

If (sin x)/(sin y)=1/2, (cos x)/(cos y)=3/2 = 3/2 , where x, y in (0,pi/4) , then the value of tan(x+y) is equal to:

If (sin x)/(sin y)=(1)/(2), (cos x)/(cos y)=(3)/(2) , where x,y in (0,(pi)/(4)) , then the value of tan (x + y) is equal to

If (sin x)/(sin y)=(1)/(2),(cos x)/(cos y)=(3)/(2), where x,y in(0,(pi)/(2)), then the value of tan(x+y) is equal to

If (sin x)/(sin y)=(1)/(2),(cos x)/(cos y)=(3)/(2), where x,y,in(0,(pi)/(2)), then the value of tan(x+y) is equal to (a)sqrt(13)(b)sqrt(14)(c)sqrt(17)(d)sqrt(15)

If (sinx + sin y ) = a and (cos x + cos y ) = b what is the value of sin x sin y + cos x cos y ?

If cos x.cos y + sin x.sin y = -1 then cos x + cos y is यदि cos x.cos y + sin x.sin y = -1 हो, तो cos x + cos y का मान क्या होगा?

If cos x+ cos y = 1//3 , sin x + sin y=1//4 " then " cos (x+y)=

If (cos^(4)x)/(cos^(2)y)+(sin^(4)x)/(sin^(2)y)=1 , then (cos^(4)y)/(cos^(2)x)+(sin^(4)y)/(sin^(2)y) equal :

(dy) / (dx) = (sin x-sin y) (cos x) / (cos y)

If sin x + sin y= (1)/(2) and cos x + cos y=1 , then tan (x+y) =______