Tag: trigonometry
- Cosine is even function cos(-x)=cos x
- Demonstration / proof of cos²x + sin²x=1
- Sine is an odd function sin(-x)=-sin x
- Tangent is an odd function tan(-x)=-tan x
- Trigonometric formula sin(2x)=2 sin x cos x
- Trigonometry addition formula cos(a+b)=cos a cos b - sin a sin b
- Trigonometry addition formula cos(a-b)=cos a cos b + sin a sin b 8080598
- Trigonometry addition formula cosh(x - y) = cosh x cosh y - sinh x sinh y 8080622
- Trigonometry addition formula sin(a+b)=sin a cos b + cos a sin b
- Trigonometry addition formula sin(a-b)=sin a cos b - sin b cos a
- Trigonometry addition formula sinh(x + y) = sinh x cosh y +cosh x sinh y
- Trigonometry addition formula sinh(x - y) = sinh x cosh y - cosh x sinh y 8080624
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