Solved example of derivatives of trigonometric functions
Multiply $3$ times $[b]$
Any expression multiplied by $0$ is equal to $0$
The derivative of the cosine of a function is equal to minus the sine of the function times the derivative of the function, in other words, if $f(x) = \cos(x)$, then $f'(x) = -\sin(x)\cdot D_x(x)$
The derivative of a sum of two functions is the sum of the derivatives of each function
The derivative of the constant function ($-5$) is equal to zero
The derivative of the linear function is equal to $1$
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