Respuesta :

sqdancefan
The sine of one acute angle is equal to the cosine of another when their sum is 90°.
.. (2β +10°) +(3β -25°) = 90°
.. 5β -15° = 90°
.. 5β = 105°
.. β = 21°

Then your equation becomes
.. sin(52°) = cos(38°)

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