cos(a-π/6)+sina=4√3/5=>sin(a+π/6)=4/5∴cos(a+π/6)=±3/5sin(a-7π/6+π/6-π/6)=sin(a+π/6-4π/3)=sin(a+π/6)cos(4π/3)-cos(a+π/6)sin(4π/3)=-sin(a+π/6)cos(π/3)+cos(a+π/6)sin(π/3)=-4/10±3√3/1...