Thursday

August 21, 2014

August 21, 2014

Posted by **Moe** on Saturday, April 27, 2013 at 9:51pm.

- Algebra 2/ Trigonometry -
**Damon**, Saturday, April 27, 2013 at 10:59pmquadrant 2

cos 2y = 1 - 2 sin^2 y

but sin y = 3/5 (3 4 5 triangle)

cos 2 y = 1 - 2 (3/5)

= 1 - 6/5

= -1/5

- Algebra 2/ Trigonometry -
**Reiny**, Sunday, April 28, 2013 at 5:36amlast 3 lines should be

cos (2y) = 1 - 2(3/5)^2

= 1 - 18/25 = 7/25 or .28

- Algebra 2/ Trigonometry -
**Damon**, Sunday, April 28, 2013 at 8:04amWhoops, thank you

**Related Questions**

algebra 1 help please - 4) a student score is 83 and 91 on her first two quizzes...

Math (Trigonometry) - 1. If sec x + tan x = 3/2 and 0 ≤ x ≤ pi/2 ...

Trig - Suppose sinA = 12/13 with 90º≤A≤180º. Suppose also that sinB...

Math (Trigonometry [Polar Form]) - Let z be a complex number such that z = 2(cos...

Math/Trigonometry - 1. Solve: 2 cos² x - 3 cos x + 1 = 0 for 0 ≤ x < ...

Trig - On the same set of axes, sketch and label the graphs of the equations y...

Algebra 2 - Solve. 4a-2≤a+1≤3a+4 4a-2-1≤a+1-1≤3a+4-1 4a-...

Pre Calculus - sec x = -2 , π ≤ x ≤ 3π Use a calculator to...

Math/Trigonometry - 1. Solve: 2 cos² x - 3 cos x + 1 = 0 for 0 ≤ x < ...

PreCalc - I'm not sure how to solve these with calculator. sec x = -2 , π...