Hitunglah sec 45°+30°-tan 60°

sec (45° + 30°) = 1/ cos(45° + 30°) 

 cos(45° + 30°) = cos 45° cos 30° - sin 45°sin 30°
= [(1/2)√2][(1/2)√3]-[(1/2)√2][1/2] =  [(1/4)√6] - [(1/4)√2]

tan 60° = √3

jadi  [(1/4)√6] - [(1/4)√2] - √3