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kenneyfamily
Group Title
MAJOR HELP PLEASE!!
Verify that the equation is an identity. Show all your work.
(sin x + cos x)^2  1 = sin 2x
 one year ago
 one year ago
kenneyfamily Group Title
MAJOR HELP PLEASE!! Verify that the equation is an identity. Show all your work. (sin x + cos x)^2  1 = sin 2x
 one year ago
 one year ago

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nubeer Group TitleBest ResponseYou've already chosen the best response.2
(a+b)^2 =a^2+2ab+b^2 so (sin x + cos x)^2  1 sin^2x+2sinxcosx+cos^2x 1 2sinxcosx +sin^2x+cos^2x 1 i think u can do from here.
 one year ago

tamtoan Group TitleBest ResponseYou've already chosen the best response.0
use formula \[(a+b)^{2} = a^{2} + 2ab + b^{2}\], expand that out and you will see what you need to
 one year ago

kenneyfamily Group TitleBest ResponseYou've already chosen the best response.0
@nubeer i'm sorry i am a little lost, could you please explain further?
 one year ago

nubeer Group TitleBest ResponseYou've already chosen the best response.2
2sinxcosx +sin^2x+cos^2x 1 have you understood how i have got this part?
 one year ago

kenneyfamily Group TitleBest ResponseYou've already chosen the best response.0
yes with the formula right?
 one year ago

nubeer Group TitleBest ResponseYou've already chosen the best response.2
2sinxcosx +sin^2x+cos^2x 1 what is sin^2x+cos^2x = ?
 one year ago

nubeer Group TitleBest ResponseYou've already chosen the best response.2
yes.. now put this 1 in the equation 2sinxcosx +sin^2x+cos^2x 1 2sinxcosx +11.. got it?
 one year ago

nubeer Group TitleBest ResponseYou've already chosen the best response.2
@kenneyfamily so?
 one year ago

kenneyfamily Group TitleBest ResponseYou've already chosen the best response.0
2sinxcosx
 one year ago

kenneyfamily Group TitleBest ResponseYou've already chosen the best response.0
@nubeer right?
 one year ago

nubeer Group TitleBest ResponseYou've already chosen the best response.2
yes and 2sinxcosx=sin2x (according to the identity)
 one year ago

kenneyfamily Group TitleBest ResponseYou've already chosen the best response.0
you're awesome..thanks!!!
 one year ago
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