Saturday

December 20, 2014

December 20, 2014

Posted by **Anonymous** on Monday, December 5, 2011 at 6:17pm.

- mathematics -
**Steve**, Tuesday, December 6, 2011 at 12:03am4 sin^2 = 1 - 2cos + cos^2

4 - 4 cos^2 = 1 - 2cos + cos^2

5cos^2 - 2cos - 3 = 0

cosx = 1 or -.6

x = 0 or 126.86°

**Answer this Question**

**Related Questions**

trig - Find all the solutions of 2 sinx=1-cosx in the interval from 0° ≤x&...

Trig........ - I need to prove that the following is true. Thanks (cosx / 1-sinx...

maths - hey, i would really appreciate some help solving for x when: sin2x=cosx ...

Maths - Solve this equation fo rx in the interval 0<=x<=360 3sinxtanx=8 I ...

Mathematics - Trigonometric Identities - Prove: (tanx)(sinx) / (tanx) + (sinx...

Pre calc - Find solutions on interval 0,2pie (cosx/1+sinx) + (1+sinx/cosx) = -4

Precalculus - Please help!!!!!!!!!!! Find all solutions to the equation in the ...

Pre-Calc - Trigonometric Identities Prove: (tanx + secx -1)/(tanx - secx + 1)= ...

Trigonometry Check - Simplify #3: [cosx-sin(90-x)sinx]/[cosx-cos(180-x)tanx] = [...

Mathematics - Trigonometric Identities - Prove: sinx + tanx = tanx (1 + cosx) ...