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Давлатшо1
@Давлатшо1
July 2022
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найдите cosa если sina=1/2и 90<а<180
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IrkaShevko
Verified answer
90 < а < 180, поэтому cosa < 0
(sina)^2 + (cosa)^2 = 1
(cosa)^2 = 1 - (1/2)^2 = 3/4
cosa = -(корень из 3)/2
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Verified answer
90 < а < 180, поэтому cosa < 0(sina)^2 + (cosa)^2 = 1
(cosa)^2 = 1 - (1/2)^2 = 3/4
cosa = -(корень из 3)/2