tan 45° × sec 30° + cos 60°

Trigonometri

tan 45 = 1
sec 30 = 1/ cos 30 = 2/3 √3
cos 60 = 1/2 √3

Maka
tan 45° × sec 30° + cos 60°
= 1× (2/3 √3) + 1/2 √3
= (4+3)√3 / 3
= 7√3/ 3