` cos 225^(@)+ sin 165^(@)=`

cos225^(@)+sin195^(@)=

The value of cos 255^(@)+sin165^(@) is

Find cos 225^(@) -sin 225^(@) +tan 495^(@) - cot 495^(@) .

Prove that 1 + (cos105^(@) + cos 165^(@))/(sin 105^(@) + sin 375^(@))= 0

Cos255^(0)+sin165^(0) =

Give the following in polar form : [3(cos 225^@ + i sin 225^@)] [6(cos 45^@+i sin 45^@)] .

Evaluate. cos225^(@)-sin225^(@)+tan495^(@)-cot495^(@)

Find the values of the following trigonometric ratios : cos225^@ , sin 690^@ , tan(-390^@) , sec 855^@

Give the following in polar form: (i) sin120^(@)-icos120^(@) (ii) [2cos210^(@)+isin210^(@))][4(cos120^(@)+isin120^(@))] (iii) [3(cos225^(@)+isin225^(@))][6(cos45^(@)+isin45^(@))] .

Find the values of (i) cos 15^(@) and (ii) tan 165^(@)