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Title says it all. I'm doing Differential equations and got to this last step and completely forgot my algebra.

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  • $\begingroup$ You could solve this numerically or graphically but I doubt that an exact solution in closed form exists. $\endgroup$ – Rory Daulton Mar 16 '15 at 0:24
  • $\begingroup$ Can you take a photo or scan of what you have already done and add that to the question? Thank you. $\endgroup$ – Pedro Mar 16 '15 at 0:29
  • $\begingroup$ What is the purpose of the DE? Are you looking for a closed form, or an approximate solution? $\endgroup$ – user207710 Mar 16 '15 at 0:40
  • $\begingroup$ WA gives approx ( 3.016.., 4.416.., 6.761 ) numerical solutions for t. But for what DE is this a solution? wolframalpha.com/input/?i=5%3Dt-+2+cos+t $\endgroup$ – Narasimham Mar 16 '15 at 0:44
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This equation

$$t - 2\cos (t) = 5$$

is of transcendental type. $t$ can be calculated with numerical methods only.

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