sin47π/6 的值?如题.

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sin47π/6的值?如题.sin47π/6的值?如题.sin47π/6的值?如题.sin47π/6=sin(48-1)π/6=sin(8π-1/6π)=sin(-1/6π)=-1/2sinx的周期是

sin47π/6 的值?如题.
sin47π/6 的值?
如题.

sin47π/6 的值?如题.
sin47π/6
= sin(48-1)π/6
= sin(8π-1/6π)
= sin(-1/6π)
=-1/2

sinx的周期是2π
所以原式=sin(4×2π-π/6)=sin(-π/6)=-sin(π/6)=-1/2