Example 6 - If cos x = -3/5 , x lies in third quadrant, find
![If \\( \\cos 5 \\theta = a \\cos \\theta + b \\cos ^ { 3 } \\theta + c \\cos ^ { 5 } \\theta + d \\) , then\n\\( \\begin{array} { l l l l } { \\text { a. } a = 20 } & { \\text { b. } b = - 20 } & { \\text { c. } c = 16 } \\end{array} \\)\](https://d2rrqu68q7r435.cloudfront.net/images/9602233/a3ecffe9-ced9-49c1-9226-c7f0fa8a1e7d.jpg "If \\( \\cos 5 \\theta = a \\cos \\theta + b \\cos ^ { 3 } \\theta + c \\cos ^ { 5 } \\theta + d \\) , then\n\\( \\begin{array} { l l l l } { \\text { a. } a = 20 } & { \\text { b. } b = - 20 } & { \\text { c. } c = 16 } \\end{array} \\)\")
If \\( \\cos 5 \\theta = a \\cos \\theta + b \\cos ^ { 3 } \\theta + c \\cos ^ { 5 } \\theta + d \\) , then\n\\( \\begin{array} { l l l l } { \\text { a. } a = 20 } & { \\text { b. } b = - 20 } & { \\text { c. } c = 16 } \\end{array} \\)\"
The mod - amp form of 1 + costheta + isintheta is
Polar graph $r = cos(5\theta)$ in xy-plane - Mathematics Stack Exchange
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Polar graph $r = cos(5\theta)$ in xy-plane - Mathematics Stack Exchange
