Nilai sin (45° + 30°) adalah

sin(a+b)= sinA cosB + cosA sinB
= sin 45 cos 30 + cos 45 sin 30
=1/2√2 . 1/2√3 + 1/2√2 . 1/2
=1/4√6 + 1/4√2
=1/4√6+√2