" (2) "cos120^(@)

Find the values of the following allied angles : (ii) cos 120^(@)

Find the value of (a) cos 120^(@) (b) sin 240^(@) (c) tan (-60^(@)) (d) cot 300^(@) (e) tan 330^(@) (f) cos (-60)^(@) (g) sin (-150)^(@) (h) cos ( -120)^(@)

Find the value of (i) cos(-30^(@)) " " (ii) sin 120^(@) " " (iii) sin135^(@) " " (iv) cos 120^(@)" " (v) sin270^(@) " " (vi) cos270^(@)

cos120^o=

cos theta + cos (120^(@) + theta ) + cos (120^(@) - theta )=

Find the value of (sin 135^(@) - cos 120^(@))/(sin 135^(@) + cos 120^(@))

Find the value of sin 330^(@) .cos 120^(@) + cos 210^(@) . Sin 300^(@) .

Prove that (i) " sin " 75^(@) =((sqrt(6)+sqrt(2)))/(4) (ii) (cos 135^(@) -cos 120^(@))/(cos 135^(@) +cos 120^(@)) =(3 -2sqrt(2)) (iii) " tan " 15^(@) +" cot " 15^(@) =4