If cosalpha=1/2(x+1/x)a n dcosbeta=1/2(y...

If `cosalpha=1/2(x+1/x)a n dcosbeta=1/2(y+1/y),(x y >0); x , y ,alpha,beta in R` then `sin(alpha+beta+gamma+singammaAAgamma in R` `cosalphacosbeta=1AAalpha,beta in R` `(cosalpha+cosbeta)^2=4AAalpha,beta in R` `sin(alpha+beta+gamma)=sinalpha+sinbeta+s ingammaAAa , b ,gamma in R`

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If cosalpha=1/2(x+1/x)a n dcosbeta=1/2(y+1/y),(x y >0); x , y ,alpha,beta in R then (a) sin(alpha+beta+gamma)=singammaAAgamma in R (b) cosalphacosbeta=1AAalpha,beta in R (c) (cosalpha+cosbeta)^2=4AAalpha,beta in R (d) sin(alpha+beta+gamma)=sinalpha+sinbeta+singamma AAa , b ,gamma in R

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If `cosalpha=1/2(x+1/x)a n dcosbeta=1/2(y+1/y),(x y >0); x , y ,alpha,beta in R` then `sin(alpha+beta+gamma+singammaAAgamma in R` `cosalphacosbeta=1AAalpha,beta in R` `(cosalpha+cosbeta)^2=4AAalpha,beta in R` `sin(alpha+beta+gamma)=sinalpha+sinbeta+s ingammaAAa , b ,gamma in R`

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