Question 1: Let f be a function and let h be a non-zero real number. Then the derivative (when it exists) of f(x), f'(x), is the limit as h tends to zero of the difference quotient f(x+h) = f(x). h O True O False For any differentiable functions, the derivative of their sum is equal to the sum of their derivatives. (Hint: in determining the truth or falsehood of this statement it may be helpful to re-write it in mathematical symbols.) O True False Considered over their respective domains, all of the trigonometric functions sine, cosine, tangent, cotangent, cosecant and secant are differentiable. O True O False

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