how to solve cos(3.78t) = -.3

how to solve cos(3.78t) = -.3
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kosine(3.78x) = -0.3

yu yuxr ythe invers kosine tu get angel=107.4576031254432 deg

so, 3.78x=107.4576...

x=107.4576/378

x=28.42793733477334
by

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