trig

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given that 1/2pi<theta<pi and sin theta=1/5, use appropriate trigonometric formulas to find the exact values of the following (i) cos(2theta) (ii) cos theta (iii) sin(2theta)

  • trig -

    since we're in QII,

    sinθ = 1/5
    cosθ = -√24/5

    now, just plug into the formulas. what do you get?

  • trig -

    analyze given equation for following characteristics. (amplitude period, phrase shift)

    y= 3sin (2x-(3.14/2))

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