sin(-19π/6)的值是多少?

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sin(-19π/6)的值是多少?sin(-19π/6)的值是多少?sin(-19π/6)的值是多少?sin(-19π/6)的值是多少?sin(-19π/6)=-sin(19π/6)=-sin(3π+

sin(-19π/6)的值是多少?
sin(-19π/6)的值是多少?

sin(-19π/6)的值是多少?
sin(-19π/6)的值是多少?
sin(-19π/6)=-sin(19π/6)=-sin(3π+π/6)=sin(π/6)=1/2

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sin(-19/6*π) = sin (-19/6*π + 4π) = sin(5/6 * π) = sin(π - 5/6*π) = sin (π/6) = 1/2