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Trigonometry
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OpenStudy (anonymous):
csca+2cota=0 I just need help with the first step
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OpenStudy (anonymous):
subtract 2cotA from both sides (cscA= -2cotA) convert to complex from (1/sin) = (- 2cos/sin) multiply bothsides by sin 1= -2cosA divide both sides by -2 (-1/2)=cos A when does the cos of an angle equal -.5?? or do the inverse cos of -.5
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