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The equation is  .

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Graph

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The points where it crosses the x  axis  will give solutions to the equation .

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The graph crosses the x  - axis at a point that would suggest a solution of the equation. \ \

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It crosses the x  - axis at one point hence there are one real root.

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x  = 2.2056

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Use synthatic division to detrmine if the given value of x  is a root of the polynomial.

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Since f (2.2056) = 0, x = 2.2056 is a zero.

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The depressed polynomial is 

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Since, the depressed polynomial of this zero, , is quadratic,

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use the Quadratic Formula to find the roots of the related quadratic equation

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The roots of the equation are .

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Put t = tan x in .

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Therefore, solutions of the given trigonometric equation are

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