Friday
April 25, 2014

Homework Help: help, bobpursely

Posted by Reiny on Monday, April 16, 2007 at 10:54pm.

Please take a look at DEVON's trig equation at 9:14

I must be missing something obvious.
If the second had been 3sin 2x it would be a straight forward question.

The way it stands I was able to "reduce" it to the equation

8sin^4 x - 8sin^2 x + 3sin x + 2 = 0

I tested this equation by subst. random values of angles in the original and this one, and got the same results, so it must be right.

??????

(must have been infected with a case of "oldtimers' disease)


2cos^2x+3sinx=0
2-2sin^2 x + 3 sinx=0
sin^2 x - 3/2 sin x - 1=0

quadratic equation..

sinx= (3/2 +-sqrt(9/4 +4) /2
sinx= 3/4 +- 5/4

sin x= -1/2 works.

check me.

Of course, of course, I knew it had to be that easy

I read the exponent as a multiplier of x

i.e. 2 cos^2 (2x) + 3 sin x .....

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

trig - find the exact solutions 2cos^2x+3sinx=0 the way it stands, that is a "...
trig - it says solve for all real solutions, compute inverse functions to 4 ...
substitution method - -x-4y=-14 2x=y+1 Let's look at your two equations. -x - 4y...
Algebra ?? - What would be the missing piece of information given the following ...
CHEM (DrBob222) - I had posted the question to that previous chem question, ...
Math- gr.12 Trig. - Hi, could someone explain to me how to use a counterexample...
Algebra - I have been asked a question regarding inconsistency. How would I use ...
Algebra - I am trying to factor polynomials by grouping the first two terms and ...
Trig - A curve with polar equation r=(8)/7sinx + 36cosx represents a line. This ...
trig - finding the equivalent polar equation 2x+3y=6 I got r=6/2cos(theta)-3sin...

Search
Members