find cos(-690degree)
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the answer is simple and i solved it .......0.86602540378
hope.it helps .u
hope.it helps .u
MrMk:
nope, cos(-690°) = cos(690°) = cos(4π - π/2) = cos( π/2) which in turn is will to zero, so, zero is the answer,..
sorry, not 4π- π/2, but 4π - π/6, so, final answer is cos(π/6), which is equal to √3/2
SORRY IF I'm wrong ,I only gave the excat value
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