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The base of the right triangle is `sqrt(x^2 + 8x)` . The height is 4. The length of the hypotenuse in terms of x is `sqrt((sqrt(x^2 + 8x))^2+ 16)` = `sqrt(x^2 + 8x + 16)` = `sqrt((x+4)^2)` = `x + 4`
The angle `theta = sin^-1(4/(x+4))`
`cos theta = sqrt(x^2 + 8x)/(x+4)`
`tan theta = 4/sqrt(x^2 + 8x)`
For the other values use : `cot theta = 1/tan theta` , `sec theta = 1/cos theta` and `cosec theta = 1/sin theta` .
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