Posted by **Sarah** on Thursday, November 15, 2012 at 2:10pm.

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 -
**Steve**, Thursday, November 15, 2012 at 3:51pm
since we're in QII,

sinθ = 1/5

cosθ = -√24/5

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

- trig -
**ashley**, Thursday, April 11, 2013 at 10:15am
analyze given equation for following characteristics. (amplitude period, phrase shift)

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

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