Sin 270° cos 135°-tan 135° ------------------------------------- Sin 150° cos 225° Pake caranya ya

= (-1)(-½√2)(1)
_________
(½)(-½√2)

= (½√2). (-¼√2)
_____. ×. ______
(-¼√2). (-¼√2)

= (-¼)
____
(⅛)

= -2