Tuesday

March 3, 2015

March 3, 2015

Posted by **Kylie** on Sunday, December 19, 2010 at 1:55pm.

cosx + sinx = 0

- trig -
**Damon**, Sunday, December 19, 2010 at 1:59pmcos and sin are equal in magnitude at 45 degrees from the axes in all quadrants

however they are opposite in sign only in quadrants 2 and 4

so

pi-pi4/ = 3pi/4 or 135 deg

2 pi - pi/4 = 7 pi/4 = 315 deg

**Answer this Question**

**Related Questions**

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

Precalculus/Trig - I can't seem to prove these trig identities and would really ...

trigonometry - can i use factoring to simplify this trig identity? the problem ...

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] = [...

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

Math - Im really struggling with these proving identities problems can somebody ...

Trigonometry. - ( tanx/1-cotx )+ (cotx/1-tanx)= (1+secxcscx) Good one! ...

Pre-calc - prove the identity: (cosx)(tanx + sinx cotx)=sinx+cos(squared)x i ...

math - solve each equation for 0=/<x=/<2pi sin^2x + 5sinx + 6 = 0? how do ...