標題:
急! F4 Basic Trigonometry 13q2
發問:
請詳細步驟教我計以下幾條 :(不要網址回答) Solve the following equations19. sinθ- cosθ= 0, where 0
最佳解答:
19) sin θ - cos θ = 0 sin θ = cos θ tan θ = 1 θ = 45 or 225 20) 3 cos θ + 4 sin θ = 0 4 sin θ = - 3 cos θ tan θ = -3/4 θ = 143.4 or 323.4 21) tan θ (3 sin θ + 2) = 0 sin θ (3 sin θ + 2) = 0 provided that cos θ =/= 0 sin θ = 0 or -2/3 θ = 0 or 180 or or 221.8 or 318.2 22) 4 cos θ sin θ + cos θ = 0 cos θ (4 sin θ + 1) = 0 cos θ = 0 or sin θ = -1/4 θ = 90 or 270 or 194..5 or 345.5 23) sin θ - √3 tan θ = 0 sin θ (1 - √3/cos θ) = 0 sin θ = 0 or cos θ = √3 (rejected) θ = 0 or 180 24) √2 sin θ = tan θ √2 sin θ = sin θ/cos θ √2 sin θ - sin θ/cos θ = 0 sin θ (√2 - 1/cos θ) = 0 sin θ = 0 or cos θ = 1/√2 θ = 0 or 180 or 45 or 315
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