Monday

July 28, 2014

July 28, 2014

Posted by **mazandie Magaduzela** on Tuesday, March 26, 2013 at 12:28pm.

- maths -
**Steve**, Tuesday, March 26, 2013 at 12:34pmwell, when does

cos(x+30) = -2sinx

√3/2 cosx - 1/2 sinx = -2sinx

√3/2 cosx = -3/2 sinx

tanx = -1/√3

since tan30 = 1/√3,

x = (180-30) or (360-30) = 150 or 330

or, more generally,

x = 180n-30 for any integer n

**Related Questions**

Math, derivatives - Let g(x) = sin (cos x^3) Find g ' (x): The choices are a) -...

maths - by equating the coefficients of sin x and cos x , or otherwise, find ...

maths - hey, i would really appreciate some help solving for x when: sin2x=cosx ...

maths - Prove Cos (x+60)= 2Sinx

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

math - Solve each equation , then write the general solution cos(pi/2(x+1))=...

maths - find the general solution of the following first order differential ...

Math - derivatives of cos and sin fucntions - a) Find an equation of a line that...

maths - Find the roots of z^6 + 1 and hence resolve z^6 + 1into read quadratic ...

maths - Find the roots of z^6 + 1 and hence resolve z^6 + 1into read quadratic ...