Thursday
May 23, 2013

# Homework Help: pre-calc

Posted by larry on Tuesday, November 13, 2007 at 11:08am.

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

• pre-calc - drwls, Tuesday, November 13, 2007 at 1:41pm

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.

Related Questions

Pre-Calc/Math - Prove Identity: (1-cos2x/ tan x) = sin2x
pre-calc - tanx= -12/5 x in Q 2. find sin2x= cos2x= tan2x=
trigonometry - Been trying this forever so it says: Simplify 1+sin2x+cos2x/1+...
maths - prove that 1+sin2x-cos2x / sin2x+cos2x = tanx
trig - sinx = 4/5 and x terminates in Quadrant II Find sin2x and cos2x How to ...
Pre-Calc Help!!!!!!!! - 1+sin2x/sin2x=1+1/2(secx)(cscx)
calc - Where do I start to prove this identity: sinx/cosx= 1-cos2x/sin2x please ...
trig - write sin4xcos2 as the sum or difference of two functions. answers: 1/2(...
trig - write sin4xcos2 as the sum or difference of two functions. answers: 1/2(...
trig - write sin4xcos2 as the sum or difference of two functions. answers: 1/2(...