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f’(x) = f(x + h) - f(x) / h
From First principles
Differentiating sin and cos
If y = f(x)n → dy/dx = n(f(x)n-1 x f’(x)
If y = ef(x) → dy/dx = f’(x)ef(x)
If y = ln(f(x)) → dy/dx = f’(x) / f(x)
If y = sin(f(x)) → dy/dx = f’(x)cos(f(x))
if y = cos(f(x)) → dy/dx = -f’(x)sin(f(x))
Chain Rule
Reverse chain rule