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三角函数值csc(a)=5,派/2
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三角函数值
csc(a)=5,派/2
csc(a)=5,派/2
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答案和解析
csc(a) = 5
π/2 < a < π,sin(a) > 0,cos(a) < 0,tan(a) > 0
sin(a) = 1/csc(a) = 1/5
cos(a) = -√(1 - sin²(a)) = -(2√6)/5
sec(a) = 1/cos(a) = -(5√6)/12
tan(a) = sin(a)/cos(a) = -(√6)/12
cos(b) = -2/9
π/2 < b < π,sin(b) > 0,tan(b) < 0
sin(b) = √(1 - cos²(b)) = (√77)/9
tan(b) = sin(b)/cos(b) = -(√77)/2
π/2 < a < π,sin(a) > 0,cos(a) < 0,tan(a) > 0
sin(a) = 1/csc(a) = 1/5
cos(a) = -√(1 - sin²(a)) = -(2√6)/5
sec(a) = 1/cos(a) = -(5√6)/12
tan(a) = sin(a)/cos(a) = -(√6)/12
cos(b) = -2/9
π/2 < b < π,sin(b) > 0,tan(b) < 0
sin(b) = √(1 - cos²(b)) = (√77)/9
tan(b) = sin(b)/cos(b) = -(√77)/2
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