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

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

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

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

Prove that tan 225^(@) cot 405^(@)+tan 765^(@) cot 675^(@)=0.

Find the value of: (i) cos 210^(@) (ii) "sin" 225^(@) (iii) "tan" 330^(@) (iv) cot(-315^(@)) (v) "sec"(11pi)/(4)

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

Find the value of sin 22.5^(@)

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

sin225^@ = …………..

Find the values of each of the following : tan225^(@),sin315^(@),tan(-1742^(@)),cos(-1760^(@)) .