find all trigonometric ratios of 30 degrees
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sin 30= 1/2
cos 30=√3/2
tan 30=1/√3
cosec 30=2
sec 30=2/√3
cot 30=√3
cos 30=√3/2
tan 30=1/√3
cosec 30=2
sec 30=2/√3
cot 30=√3
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