Given `3 sinbeta + 5 cosbeta = 5`, then the value of `(3cosbeta-5sinbeta)^2 ` is

Let alpha,beta be such that piltalpha-betalt3pi . If sinalpha+sinbeta=-(21)/(65)andcosalpha+cosbeta=-(17)/(65) , then the value of cos.(alpha-beta)/(2) is :

Let alphaandbeta be such that piltalpha-betalt3pi . If sinalpha+sinbeta=-(21)/(65)and cosalpha+cosbeta=-(27)/(65) , then the value of "cos"((alpha-beta))/(2) is

If sinalpha-sinbeta=a and cosalpha+cosbeta=b then write the value of "cos"(alpha+beta) .

If (cosalpha)/(cosbeta) = a and (sinalpha)/(sinbeta) = b , then the value of sin^2 beta interms of a and b is____

If cosalpha+cosbeta+cosgamma=sinalpha+sinbeta+singamma=0 , then the value of cos3alpha+cos3beta+cos3gamma is

If sinalpha+sinbeta=1/2 , cosalpha+cosbeta=5/4 find the value of tanalpha+tanbeta

If cosalpha+cosbeta=2/3 and sinalpha+sinbeta=2/5 then find the vvalue of tan((alpha+beta)/2)

If sinalpha+cosbeta=5/4 and cosalpha+sinbeta=3/4 , then value of sin(alpha+beta)=?

If alpha+beta=90^(@) , then find the value of cotbeta+cosbeta-(cosbeta)/(cosalpha)(1+sinbeta)

If cosalpha+2cosbeta+3cosgamma=sinalpha+2sinbeta+3singamma=0 then the value of sin 3alpha+8sin3beta+27sin 3gamma , is