Sunday

December 21, 2014

December 21, 2014

Posted by **Bob** on Tuesday, January 29, 2013 at 9:52pm.

(1) 40 degrees

(2) 150 degrees

(3) 166 degrees

(4) 194 degrees

- trig -
**Reiny**, Tuesday, January 29, 2013 at 10:41pmI don't know if you are supposed to do this by simply substiting, or actually solve the equation.

I will solve it

2sinx + 4cos 2x = 3

2sinx + 4(1 - 2sin^2 x) -3=0

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

8sin^2 x - 2sinx -1 = 0

sinx = (2 ± √36)/16 = 1/2 or -1/4

x = 30° or 150° or x = 194.4775..° or 345.522°

so to the nearest degree I got

x = 30, 150, 194 and 346

I see only two of these in your list, so the others don't work

**Answer this Question**

**Related Questions**

trigonometry (please double check this) - Solve the following trig equations. ...

trig - 2sin(x)cos(x)+cos(x)=0 I'm looking for exact value solutions in [0, 3&#...

trig - How do you express in terms of angles less than 90 degrees? sin 120 ...

Trigonometry - Solve the equation cos^2A = sin^2A + sinA when 0¨¬¡ÂA¡Â360¨¬. ...

Math - Find the approximate number of radians, to the nearest hundreth, in the ...

trig - Find all angles in degrees that satisfy the equation. Round approximate ...

trig - Give the measure of the acute angle with each given value to the nearest ...

trig - find to the nearesr degree, all values of x between 0 degrees and 360 ...

Pre Cal - 2cos 4theta + 1 = 0 i know how to find the degrees (the last step of ...

Trig - Solve ABC if C=90 degrees, B=20 degrees, and b=10. Round measures of side...