exact value of sin,cos and tan.
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•Sin0°= 0 , Sin30°=1/2 , Sin45°=1/Root 2 , Sin60°=Root 3/2 , Sin90°=1
•Cos0°= 1 , Cos30°=root3/2 , Cos45°=1/root 2 , Cos60°=1/2, Cos90°=0
•Tan0°=0 , Tan30°=1/root3 , Tan45°=1 , Tan60°=root3 , Tan90°= Not defined
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