The double angle formula is a very useful type of formula in trigonometric functions. That is, the trigonometric function of the double angle is represented by the trigonometric function of the corner. In the calculation, it can be used to simplify the calculation formula and reduce the number of trigonometric functions. It is also widely used in engineering.
Trigonometric function multiplier formula
\(sin2θ = 2sinθ cosθ\)
\(tan2θ= 2tanθ / (1 - tan^2θ)\)
\(cos2θ= 1 - 2sin^2θ\)
θ(degree)：30
Click "sin(2u)" and output the result
Results: sin60 = 0.866025
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