nilai cos 150° + sin 45° - 1/2 cot (-330°) adalah, beserta caranyanya yaa..

=cos(180-30) + sin45 - 1/2 (-cot(330))
= -cos30 + sin45 + 1/2 cot(360-30)
= -cos30 + sin45 + 1/2(-cot30)
= - 1/2 akar3 + 1/2 akar2 - 1/2 akar3
= 1/2 akar2 - akar3

smg mbantu