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Math-only-math.com

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Proof of Compound Angle Formula sin^2 α - sin^2 β

Proof of Compound Angle Formula sin^2 α - sin^2 β

We will learn step-by-step the proof of compound angle formula sin 2 α - sin 2 β. We need to take the help of the formula of sin (α + β) and sin (α - β) to ...Read more

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Trigonometrical Ratios of (180° - θ)

Trigonometrical Ratios of (180° - θ)

cos (180° - θ) = cos (90° + 90° - θ). = cos [90° + (90° - θ)]. = - sin (90° - θ), [since cos (90° + θ) = -sin θ]. Therefore, cos (180° - θ) = - cos θ, [since ...Read more

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