Tuesday

September 30, 2014

September 30, 2014

Posted by **Debbie** on Sunday, May 2, 2010 at 6:56pm.

Use identities to find the indicated value for each angle measure.

sin θ = 12/13, cos θ > 0

Find cos (2θ).

- TRIG -
**MathMate**, Sunday, May 2, 2010 at 7:43pmcos(2θ)

=cos²(θ)-sin²(θ)

=(1-sin²(θ))-sin²(θ)]

=1-2sin²(θ)

Can you do the rest?

**Answer this Question**

**Related Questions**

Math - Calculus - The identity below is significant because it relates 3 ...

Trigonometry - I just want to know if this answer is correct, 120/169. Use ...

math trigono - 1. If tanθ = –√3 , what is the value of cot ? 2. ...

trig - An object Is propelled upward at an angle θ, 45° < θ<90...

trigonometry - if cosθ=2/3 and tanθ<0 find the exact value sin(&#...

math - if cosθ=2/3 and tanθ<0 find the exact value sin(θ-5&#...

Trig - Given that csc θ = -4 and tan θ > 0, find the exact value of...

Trig - Given that cos θ = 5/13 and θ is in QIV, find the exact value ...

trig - cosθ =5/13 with -π/2 < θ <0 find each of the ...

trig - Use the fundamental identities to simplify the expression. cos^2θ/...