(a) Find the value of followings : (i)...

(a) Find the value of followings :
(i) `sin 150^(@)` , (ii) ` cos 135^(@)` , (iii) ` cos (-30^(@))`, (iv) ` tan 225^(@)` .
(b) If ` cos theta =(4)/(5) `. Find the value of ` sin theta` and ` tan theta` .
(c) Find the value of ` sin ^(-1)(1)` .

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