Please need help with this question!
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Use $\displaystyle (a+b)^2 = a^2+2ab+b^2$.
I tried doing this and i ended up with 2sin(a)cos(a)=0 where a=alpha, but i am not too sure where to go from there?
Calmo Study trigonometry a little bit. you have to know that 2sinacosa=sin(2a) therefore you have to solve the equation sin(2a)=0 which is very easy...
Last edited by MINOANMAN; Mar 15th 2013 at 02:05 AM.
OK 2 sin A cos A = 0 that is when sinA = 0 or cos A = 0 sin A = 0 when A = 0 or pi and cos A = 0 when A = pi/2 I am sure you can finish it now
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