double derivative of sin(x) and cos(x)

1) Let's differentiate: ddx(sin(x))
ⓘ The derivative of sin(x) is cos(x): ddx(sin(x)) = cos(x)
cos(x)
2) Let's differentiate: ddx(cos(x))
ⓘ The derivative of cos(x) is -sin(x): ddx(cos(x)) = -sin(x)
▶Derivative:   -sin(x)
3) Let's differentiate: ddx(cos(x))
ⓘ The derivative of cos(x) is -sin(x): ddx(cos(x)) = -sin(x)
-sin(x)
4) Let's differentiate: ddx(-sin(x))
ⓘ The derivative of sin(x) is cos(x): ddx(-sin(x)) = -cos(x)
▶Derivative:   -cos(x)

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