grade 12 trig

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If cos A-1=0, where 0<or= A< 2pi, then A=? The answer I got was pi/3,5pi/3. I don't know where I went wrong can you please help. thanks

  • grade 12 trig -

    cos(A) -1 = 0
    or
    cos(A) = 1
    arccos(1) = A = 0

  • grade 12 trig -

    cot 17= 3.2709 what does tan of 73 equal

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