Proving trigonometric identities Calculator
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$\sin\left(4\right)=2\sin\left(2\right)\cdot \cos\left(2\right)$
2
Calculating the sine of $4$ degrees
$-0.7568=\cos\left(2\right)\cdot 0.9093\cdot 2$
3
Multiply $2$ times $\frac{\sqrt{3}}{2}$
$-0.7568=\cos\left(2\right)\cdot 1.8186$
4
Calculating the cosine of $2$ degrees
$-0.7568=-0.4161\cdot 1.8186$
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Multiply $\sqrt{3}$ times $-\frac{67}{161}$
$-0.7568=-0.7568$
6
$-0.7568$ not equal to $-0.7568$
$false$