求下列各教的三角函数值(1)0;(2)π/2;(3)2π/3
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(1)sin0=0 cos0=1 tan0=0 cot0=∞ sec0=1 csc0= ∞
(2)sin(π/2)=1 cos(π/2)=0 tan(π/2)=∞ cot(π/2)=0 sec(π/2)=∞ csc(π/2)=1
(3)sin(2π/3)=√3/2 cos(2π/3)=-1/2 tan(2π/3)=-√3 cot(2π/3)=-√3/3 sec(2π/3)=-2
csc(2π/3)=2√3/3
(2)sin(π/2)=1 cos(π/2)=0 tan(π/2)=∞ cot(π/2)=0 sec(π/2)=∞ csc(π/2)=1
(3)sin(2π/3)=√3/2 cos(2π/3)=-1/2 tan(2π/3)=-√3 cot(2π/3)=-√3/3 sec(2π/3)=-2
csc(2π/3)=2√3/3
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