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Find the values of the following trigono...

Find the values of the following trigonometric ratios. `cos e c390^0` (ii) `cot570^0` (iii) `t a n480^0` (iv) `cos270^0` (v) `t a n(19pi)/3` (vi) `s in((-11pi)/3)` (vii) `cot(-15pi)/4`

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