Saturday

November 22, 2014

November 22, 2014

Posted by **william** on Friday, May 2, 2008 at 12:10am.

6tanx - 4sinx = 1

i tried it but got a quartic formula :S

16sin^4x + 8sin^3x + 37sin^2x - 36 = 0

- trig -
**Reiny**, Friday, May 2, 2008 at 8:30amThis is a "nasty" problem and it does not simplify easily.

I don't know how you got your quartic equation.

I rewrote it as 6tanx = 1 + 4sinx

then graphed f(x) = 6tanx and

g(x) = 1+ 4sinx

There are two intersection points, one in quadrant I and another in quadrant III.

After a few iterations, I got x= 23.27º to come pretty close.

This is way beyond any highschool level I know, where did you get that question ?

- trig -
**william**, Friday, May 2, 2008 at 10:51pmI got the quartic by moving the sin to the right, squaring both sides, then multiplying everything by sin^2 and then changing the cos to sin.

My friend gave me this question, and he got it from his virtual school for gr 12 advanced functions lol.

**Answer this Question**

**Related Questions**

calc - The equation of the tangent line to y=f(x) at a=2 can be written in the ...

calculus-integration! - should i use substitution?? if yes how should should i ...

precal! - Prove: (3cosx + 4sinx)^2 + (4cosx - 3sinx)^2=5 ...this is all under ...

math - solve the following trig equation : 7 = 8sin(1/2)x. I can solve this ...

Algebra - Use the formula C=2pi to find the radius, r, for a circle with a ...

Math-Trig - 1. Create an algebraic expression for sin(arccosx-arcsin3x) 2. The ...

equations trig - 8sin^2x+sinxcosx+cos^2x=4

PRECAL! - Prove: (3cosx + 4sinx)^2 + (4cosx - 3sinx)^2=5 ...this is all under ...

help, bobpursely - Please take a look at DEVON's trig equation at 9:14 I must be...

trig - I dont understand this. can you please tell how you got each answer? ...