cos^2θ - tan^2θsin^2θ=???
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cos²θ - tan²θsin²θ = cos²θ - (sin²θ/cos²θ)sin²θ = cos²θ - (sin⁴θ/cos²θ) = (cos⁴θ - sin⁴θ)/cos²θ = (cos²θ + sin²θ)(cos²θ - sin²θ)/cos²θ = (cos²θ- sin²θ)/cos²θ = 1 - tan²θ
参考: micatkie
cos^2θ - tan^2θsin^2θ cos^2θ-(sin^2θ/cos^2θ)(sin^2θ) cos^2θ-(sin^4θ/cos^2θ) (cos^4θ-sin^4θ)/cos^2θ (cos^2θ-sin^2θ)/cos^2θ(It can be wer) 1-tan^2θ(It is better)
参考: micatkie
cos^2θ - tan^2θsin^2θ cos^2θ-(sin^2θ/cos^2θ)(sin^2θ) cos^2θ-(sin^4θ/cos^2θ) (cos^4θ-sin^4θ)/cos^2θ (cos^2θ-sin^2θ)/cos^2θ(It can be wer) 1-tan^2θ(It is better)
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