If `theta+phi=pi/2` where `theta` and `phi` are positive then `(sintheta+sinphi)sin(pi/4)` is always less than

If theta+phi=(pi)/(3) where theta and phi are positive angles, then the maximum value of tan theta tan phi is equal to

If cos theta = 3/5 and cos phi =4/5, where theta and phi are positive acute angles, then cos ""(theta - phi)/(2)=

If costheta=(3)/(5)andcosphi=(4)/(5) , where theta and phi are positive acute angles, then cos((theta-phi)/(2))=?

If sintheta=1/2, cosphi=1/3 then theta+phi belongs to, where 0

If theta - phi=pi/4 , prove that : (1 + tan theta)(1+tan phi)=2 tan theta .

cos 2 (theta+ phi) +4 cos (theta + phi ) sin theta sin phi + 2 sin ^(2) phi=

cos 2 (theta+ phi) +4 cos (theta + phi ) sin theta sin phi + 2 sin ^(2) phi=

If theta+phi=pi/3 , then for what value of a sin theta . Sin phi is maximum ?

If sin theta=(1)/(2)cos phi=(1)/(3) then theta+phi belogs to where 0

Find cos( theta + phi) " where " theta " and " phi " are acute angles and " sin theta = 4/5 " and " sin phi = 3/5.