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March 28, 2017

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Find values of all six trig functions if sin(theta)= 4/5 and theta is in the second quadrant.

  • Trig - ,

    If sin(x)= 4/5 then O=4, H=5 from SOH-CAH-TOA. Using pythagorean thm. yields A=3.
    cos(x)=A/H
    tan(x)=O/A
    csc(x)=H/O
    sec(x)=H/A
    cot(x)=A/O. In the 2nd quadrant sin,csc are positive, the other 4 are negative.

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