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)

Answer 1

since we're in QII,

sinθ = 1/5
cosθ = -√24/5

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

Answer 2

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

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