sin(-7π/6)求值
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sin(-7π/6)求值sin(-7π/6)求值sin(-7π/6)求值sin(-7π/6)=-sin(-7π/6+π)=-sin(-π/6)=sin(π/6)=1/2本题用到公式:sina=-sin
sin(-7π/6)求值
sin(-7π/6)求值
sin(-7π/6)求值
sin(-7π/6)
=-sin(-7π/6+π)
=-sin(-π/6)
=sin(π/6)
=1/2
本题用到公式:sina=-sin(π+a)
sin(-a)=-sina
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