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Transforming this graph to cos3x by shrinking it along the x axis by 3 units. We get, From the above graph we can say that the number of points of intersection .how to solve cos(3x)=-1 on the interval [0,2pi] part .. Get an answer for 'how to solve cos(3x)=-1 on the interval [0,2pi] part 1 : solve this equation for 3x, finidng all values on the interval [0,2pi] that .1 answer  ·  You need to remember how to solve a simple trigonometric equation, such that:cos x = y => x = +-cos^(-1)y + 2n*piNotice that the problem specifies .Question Solve the equation cos(3x) = 0 given that 0 < x <. The function is represented as cos ⁡ ( 3 x ) = 0 , where the interval is 0 ≤ x ≤ 2 π . The value of .1 answer  ·  Top answer: The function is represented as cos(3x)=0 , where the interval is 0<=x<=2pi . The value of cosx is 0 at pi/2 and (3pi)/2 . Reloj Fossil Hombre Deportivo, cos3x=0 - Nonlinear equations. 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