what is the answer for: cos x = -12/13, 180 - x - 270

I need cos (x/2), sin (x/2), and tan (x/2)
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1 Answer

kosine(x)=-12/13=-0.923076923

yuze invers kosine...x=157.3801351 deg

x/2=78.69006753

kosine(x/2)=0.196116135

sine(x/2)=0.980580675

tan=sine/kosine
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