9. The functionf is such that f(x) = 3 – 4 cosx, for 0

Trigonometry (11th Edition)
11th Edition
ISBN:9780134217437
Author:Margaret L. Lial, John Hornsby, David I. Schneider, Callie Daniels
Publisher:Margaret L. Lial, John Hornsby, David I. Schneider, Callie Daniels
Chapter1: Trigonometric Functions
Section: Chapter Questions
Problem 1RE: 1. Give the measures of the complement and the supplement of an angle measuring 35°.
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9.
The functionf is such that f(x) = 3 – 4 cosx, for 0 < x<T, wherek is a cor
%3D
(i) In the case where k = 2,
(a) find the range of f,
(b) find the exact solutions of the equation f(x) = 1.
(ii) In the case where k = 1,
(a) sketch the graph of y = f(x),
%3D
(b) state, with a reason, whether f has an inverse.
D (a) A circle is divided into 6 sectors in such a way that the angles of th
progression. The angle of the largest sector is 4 times the angle of
that the radius of the circle is 5 cm, find the perimeter of the smallest
(b) The first, second and third terms of a geometric progression are 2k + =
Given that all the terms of the geometric progression are positive, cal-
(i) the value of the constant k,
(ii) the sum to infinity of the progression,
Transcribed Image Text:9. The functionf is such that f(x) = 3 – 4 cosx, for 0 < x<T, wherek is a cor %3D (i) In the case where k = 2, (a) find the range of f, (b) find the exact solutions of the equation f(x) = 1. (ii) In the case where k = 1, (a) sketch the graph of y = f(x), %3D (b) state, with a reason, whether f has an inverse. D (a) A circle is divided into 6 sectors in such a way that the angles of th progression. The angle of the largest sector is 4 times the angle of that the radius of the circle is 5 cm, find the perimeter of the smallest (b) The first, second and third terms of a geometric progression are 2k + = Given that all the terms of the geometric progression are positive, cal- (i) the value of the constant k, (ii) the sum to infinity of the progression,
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