標題:
F.4 Maths...Solving Trigonometric Equations,,,help! -_-
發問:
plz~淨係一條step 加一個答案! 1.cosθ= -(√3)/2 and 0(degree) ≦ θ ≦ 360(degree) 2.tanθ= -√3 and 0(degree) ≦ θ ≦ 360(degree) 3.sinθ= -(√2)/2 and 0(degree) ≦ θ ≦ 360(degree) 4.cosθ= 0.36 and 0(degree) ≦ θ ≦ 360(degree) 5.tanθ= 2.5 and 0(degree) ≦ θ ≦ 360(degree) P.S.(degree) =the symbol of the angle
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最佳解答:
1.cosθ= -(√3)/2 and 0o ≦ θ ≦ 360o cosθ= -(√3)/2 θ = 150o 或 θ = 210o 2.tanθ= -√3 and 0o ≦ θ ≦ 360o tanθ= -√3 θ = 120o 或 θ = 300o 3.sinθ= -(√2)/2 and 0o ≦ θ ≦ 360o sinθ= -(√2)/2 θ = 225o 或 θ = 315o 4.cosθ= 0.36 and 0o ≦ θ ≦ 360o cosθ= 0.36 θ = 68.9o 或 θ = 111.1o 5.tanθ= 2.5 and 0o ≦ θ ≦ 360o tanθ= 2.5 θ = 68. 2o 或 θ = 248.2o
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