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Showing posts with the label Anand Kumar Upadhyay

How Sin (A+B) × Sin (A-B) = Sin²A - Sin²B ?

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How Sin (A+B) × Sin (A-B) = Sin²A - Sin²B ? ➡  Sin(A+B) = SinA CosB + CosA SinB ➡  Sin(A-B) = SinA CosB - CosA SinB
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How Cos 2θ = (1 - tan²θ)/ (1 + tan²θ) ?

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How Cos 2θ = (1 - tan²θ)/ (1 + tan²θ) ? ➡ Cos(2A) = Cos²A - Sin²A
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How Sin 2θ = (2 tanθ)/(1+ tan²θ) ?

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How Sin 2θ = (2 tanθ)/(1+ tan²θ) ? ➡ Sin(2A) = 2 SinA CosA
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How tan (3A) = (3tanA - tan³A)/(1-3tan²A)?

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How tan (3A) = (3tanA - tan³A)/(1-3tan²A)? 👉 How tan(A+B) = (tanA + tanB)/(1- tanA tanB ) ?
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How tan (2A) = (2 tan A)/ (1- tan²A) ?

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How tan (2A) = (2 tan A)/ 1- tan²A? ➡   How tan(A+B) = (tanA + tanB)/(1- tanA tanB ) ?
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Cos (3A) = 4 Cos³A - 3 CosA

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Cos (3A) = 4 Cos³A - 3 CosA?
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