# pre-calc

is x=15 degrees a solution of radical 3/3 cos2x+sin2x=0

1. 👍 0
2. 👎 0
3. 👁 180
1. By radical 3 do you mean the cube root of (3 cos2x+sin2x) ?

Do you mean cos^2 x and sin^2 x or cos (2x) and sin (2x)?

The cube root will be zero if and only if 3cos2x+sin2x is also zero. Put in 15 degrees for x and see what you get.

1. 👍 0
2. 👎 0

## Similar Questions

1. ### Trigonometry

find sin2x, cos2x, and tan2x if sinx= -2/sqrt 5 and x terminates in quadrant III

2. ### Trigonometry

Simplify the expression using trig identities: 1. (sin4x - cos4x)/(sin2x -cos2x) 2. (sinx(cotx)+cosx)/(2cotx)

Express sec2x in terms of tanx and secx I know you have to sec(2x) = 1/cos(2x) = 1/(cos²x - sin²x) But how do you split that. Like how to simplify that?

4. ### dai so

chung minh dang thuc (1+Sin2x)/Cos2x=Tan(pi/4+x)

1. ### Trigonometry

Prove: 1-tanx/1+tanx=1-sin2x/cos2x

2. ### PreCalculus

Sin5x cos2x + cos5x sin2x=

3. ### Math

Solve the equation sin2x=2cos2x, for 0 degrees

4. ### trigonometry

if sin2x=3sin2y, prove that: 2tan(x-y)=tan(x+y) ( here, in sin2x, 2x is an angle., like there's a formula:sin2x=2sinxcosx and sin2y=2sinycosy; ....)

1. ### math

angle x lies in the third quadrant and tanx=7/24 determiner an exact value for cos2x determiner an exact value for sin2x

2. ### trig

sinx = 4/5 and x terminates in Quadrant II Find sin2x and cos2x How to get the answers, which are sin2x = -24/25, cos2x = -7/25?

3. ### Math

Solve the equation 2cos2x = √3 for 0°≤x≤360° I did this: cos2x = √3 /2 2x=30 x=15 x=15, 165, 195, 345 Is this correct? Solve the equation √3 sin2x + cos2x = 0 for -π≤x≤π No idea how to approach this one Thanks a

4. ### Maths

Prove that sin2x+cos2x-1/sin2x+cos2x+1=tanx