Saturday

November 22, 2014

November 22, 2014

Posted by **Jake** on Wednesday, January 25, 2012 at 10:06pm.

cosx+1/2=1

cosx+1=2

cosx=2-1

cosx=1

therefore 1 solution?

A) 1

b) 2

c) 3

d) 4

- Math -
**Reiny**, Wednesday, January 25, 2012 at 10:54pmWhat did you do ????

cosx + 1/2 = 1

cosx = 1/2

the cosine is positive in quads I and IV

x = 30° or x = 330° or (π/6 and 11π/6)

so obviously 2 solutions between 0 and 2π

- Math -
**Jake**, Wednesday, January 25, 2012 at 11:08pmHow come I am not suppose to get rid of the the denominator?

- Math -
**Reiny**, Thursday, January 26, 2012 at 8:30amif you had multiplied by 2 then your second line should have been

2cosx + 1 = 2 . and then

2cosx = 1

cosx = 1/2 , now pick it up in my solution.

you forgot to multiply the cosx by 2

**Answer this Question**

**Related Questions**

Math - Verify the identity . (cscX-cotX)^2=1-cosX/1+cosX _______ sorry i cant ...

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] = [...

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

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

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

RESPONSE to PreCalc Question - h t t p : / / w w w . j i s k h a . c o m / d i s...

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

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

Math 12 - Simplify #1: cscx(sin^2x+cos^2xtanx)/sinx+cosx = cscx((1)tanx)/sinx+...