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zordoloomBest ResponseYou've already chosen the best response.1
Do you still need help?
 one year ago

sabika13Best ResponseYou've already chosen the best response.0
RS: (sin^2x+cos^2x)2cos^2x sin^2xcos^2x Thats how much i can simplify right side..
 one year ago

zordoloomBest ResponseYou've already chosen the best response.1
So here is how I proved it:
 one year ago

zordoloomBest ResponseYou've already chosen the best response.1
So, change sinx^4 to (1cosx^2)^2
 one year ago

zordoloomBest ResponseYou've already chosen the best response.1
You can expand that and you get 12cosx^2+cosx^4cosx^4=12cosx^2
 one year ago

zordoloomBest ResponseYou've already chosen the best response.1
Do you follow so far?
 one year ago

zordoloomBest ResponseYou've already chosen the best response.1
@sabika13 Should I continue?
 one year ago

zordoloomBest ResponseYou've already chosen the best response.1
When you simplify 12cosx^2+cosx^4cosx^4=12cosx^2, the left side becomes 12cosx^2=12cosx^2
 one year ago

zordoloomBest ResponseYou've already chosen the best response.1
That proves the identity.
 one year ago

zordoloomBest ResponseYou've already chosen the best response.1
Normally, when you prove an identity, you work on one side. In this problem I worked on the left side.
 one year ago

sabika13Best ResponseYou've already chosen the best response.0
wait how does (12cosx^2)^2=12cos^2+cosx^4?
 one year ago

zordoloomBest ResponseYou've already chosen the best response.1
To summarize it: You have sin(x)^4cos(x)^4=12cos(x)^2 change sin(x)^4 >(1cos(x)^2)^2 You have: (1cos(x)^2)^2cos(x)^4=12cos(x)^2 Then expand (1cos(x)^2)^2 on the left side. You get 12cos(x)^2+cos(x)^4cos(x)^4=12cos(x)^2
 one year ago

zordoloomBest ResponseYou've already chosen the best response.1
Then the: cos(x)^4cos(x)^4 cancel out.
 one year ago

sabika13Best ResponseYou've already chosen the best response.0
im having problems expanding (1cos^2x)^2 shouldnt it be: 1cos^4x :S
 one year ago

zordoloomBest ResponseYou've already chosen the best response.1
So, (1cos^2x)(1cos^2x). Just foil out.
 one year ago

sabika13Best ResponseYou've already chosen the best response.0
ohhh okay, but why is it not: (1cos^2x)(1+cos^2x)
 one year ago

zordoloomBest ResponseYou've already chosen the best response.1
It's squared. It's not a difference of squares.
 one year ago

sabika13Best ResponseYou've already chosen the best response.0
ohh i think i get it...
 one year ago

zordoloomBest ResponseYou've already chosen the best response.1
Any number, or equation squared is the same as it times by itself. Example (6)^2= (6)*(6) or (3x2)^2= (3x2)(3x2). Do you get the point?
 one year ago

zordoloomBest ResponseYou've already chosen the best response.1
You don't change the signs inside the equation.
 one year ago

sabika13Best ResponseYou've already chosen the best response.0
yeah so whats difference of squares then (if you dont mind me asking)
 one year ago

zordoloomBest ResponseYou've already chosen the best response.1
example x^24. When you factor it, you get (x2)(x+2). It's a^2b^2
 one year ago

sabika13Best ResponseYou've already chosen the best response.0
ohhh thankkyou!!you helped me fix a very big misconception inmy head ;P
 one year ago
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