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if three straight lines xcosalpha + ysinalpha=p , xcosbeta + ysinbeta=q and y=xtanthetha are concurrent then prove that pcos(thetha-beta)=qcos(thetha-alpha)

Answer» if three straight lines xcosalpha + ysinalpha=p , xcosbeta + ysinbeta=q and y=xtanthetha are concurrent then prove that pcos(thetha-beta)=qcos(thetha-alpha)


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