Formulas expressing trigonometric functions of an angle in terms of functions of an angle ,
(1)
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(2)
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(3)
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(4)
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(5)
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The corresponding hyperbolic function double-angle formulas are
(6)
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(7)
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(8)
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Formulas expressing trigonometric functions of an angle in terms of functions of an angle ,
(1)
| |||
(2)
| |||
(3)
| |||
(4)
| |||
(5)
|
The corresponding hyperbolic function double-angle formulas are
(6)
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(7)
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(8)
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Weisstein, Eric W. "Double-Angle Formulas." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Double-AngleFormulas.html