Trignometry questions EASY HELP

1. Which is a solution to the equation below? sin2xsecx=1

2. What is the exact value of cos15 degrees?

3. Which expression is equivalent to the expression below? cos^2 xsin^2?

4. What is the exact value of cos2theta? one side is 8 and the other is 15

5. The angle x lies in quadrant ll. If sinx=3/5, then what is the exact value of tan2x?

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  1. PLEASE HELP ME OUTTTTTTTTTTTTTTTTTTT

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  2. This assignment is obviously meant to study the double angle formulas

    1.
    sin 2x secx = 1
    2sinxcosx(1/cosx) = 1
    sinx = 1/2
    so x is in I or II
    x = 30 or 150 degrees or pi/6, 5pi/6 radians

    2. use cos2A = 1 - 2cos^2 A
    cos 30 = 1 - 2cos^2 A
    you should know cos 30, sub it in and simplify

    how about you trying some of these.

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  3. in #2 I had my formula backwards

    should say

    cos 2A = 2cos^2 A - 1
    cos 30 = 2cos^2 15 - 1

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