Question

Minta tolong dong yang bisa ngerjakan soal itu.

Answer 1

(cos 60 × cos 135)/cos 315
= (1/2 × cos (180-45))/cos (360-45)
= (1/2 × - cos 45)/cos 45
= (1/2 × -1/2√2)/(1/2√2)
= -1/2