Q74 · Practice questionComplex familiar5 marks
QUESTION 74 (5 marks)
The curve passes through .
a)[2 marks]
Use implicit differentiation to obtain in terms of and .
b)[2 marks]
Determine the equation of the tangent at .
c)[1 mark]
Determine the acute angle the tangent makes with the horizontal, to the nearest .
WORKED SOLUTION
5 marksPractice marking scheme
ANSWER
(a) ; (b) ; (c) .
Worked solution
(a) Differentiating implicitly gives
(b) At , . Therefore the tangent is .
(c) The acute angle is .
Obtains the implicit derivative.
Determines the gradient and tangent equation.
Determines the acute angle.
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