plis jawab no 39 buat utsssssss

cos 30 . sin (180+30) - (-cosec 90) + sec 0
= √3/2 . sin 30 + cosec 90 + 1
= √3/2 . -(1/2) + 1 + 1
= -√3/4 + 8/4
= (8 - √3)/4
= 1,56698