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Find the values of the following trignom...

Find the values of the following trignometric ratios: (a) `cos 855^(@)`, (b) `sin 4530^(@)` ( C) `tan (-585^(@))` (d) `cot((-15pi)/(4))`

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(a) `-1/sqrt(2)`,
(b) `-1/2`
( c) `-1`
(d) 1
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