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lanjut dengan batas atas 60 derajat
sedangkan batas bawah 30 derajat
substitusi menghasilkan
3 . sin 60 + 5 . cos 60 - (3 . sin 30 + 5 . cos 30)
= 3 . 1/2 √3 + 5 . 1/2 - 3 . 1/2 - 5 . 1/2 √3
= 3/2 √3 + 5/2 - 3/2 - 5/2 √3
= 3/2 √3 - 5/2 √3 = - √3