Qualification > Math

C3 and C4 DOUBTS HERE!!!

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Malak:

--- Quote from: astarmathsandphysics on November 19, 2011, 09:12:17 pm ---There is nothing in common there because the powers are not the same.

--- End quote ---
What about the (2x + 1)^(0.5), is that not common?  :-\

astarmathsandphysics:
Because the power of one of them is negative, so is the same as 1/(2x+1)^(0.5)

WARRIOR:
COS ( 2x + PIE/3) + COS (2x - PIE/3 ) = COS2X

how is the above proven :O?

astarmathsandphysics:
cos2xcos pi/3 -sin2x sin pi/3 +cos 2x cos pi/3 +sin 2x sin pi/3 = 2cos 2x cos pi/3 =cos 2x because cos pi/3 =1/2

Malak:
Anyone?

I get the first step but then i am confused as to how they simplfy the numerator to 8 O_O

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