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Which of the following is equal to 1−cos2θ?1-\cos^2\theta?1−cos2θ?
Which of the following is equal to 1−sin2θ?1-\sin^2\theta?1−sin2θ?
Which of the following is equal to (1−cosθ)(1+cosθ)?(1-\cos\theta)(1+\cos\theta)?(1−cosθ)(1+cosθ)?
Which of the following is equal to (sinθ−1)(sinθ+1)?(\sin\theta-1)(\sin\theta+1)?(sinθ−1)(sinθ+1)?
Which of the following is equal to sec2θtan2θ+1?\dfrac{\sec^2\theta}{\tan^2\theta+1}?tan2θ+1sec2θ?
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