cos(п/10)+sin(п/10) преобразовать в сумму

cosπ/10+sinπ/10=√2sin(π/4+π/10)=√2sin(5π+2π)/20=√2sin7π/202)cos(π/2-4π/10)+sinπ/10=sin4π/10+sinπ/10=2sin((5π/10):2)*cos(3π/10):2=2sin(π/4)*cos(3π/20)=2*(√2/2)*cos(3π/20)=√2cos(3π/20)