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Find the smallest positive angle x satisfying cos(3x) + sin(3x) = 0.

 May 15, 2020
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cos 3x = - sin 3x

 

let q = 3x

 

cos q = - sin q

q = 135 degrees           q = 3x        135/3 = 45 degrees = x

 May 15, 2020

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