Catsarecool97
Verify that sin(x+pi/2)=cosx



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AravindG
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use sin(A+B) formula

primeralph
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dw:1372182326719:dw

Catsarecool97
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Wait what?

AravindG
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do you know sin(A+B) expansion?

Catsarecool97
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yes. sin(x+y)=sinxcosy+cosxsiny

AravindG
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ok here y=pi/2

AravindG
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substitute and put values

Catsarecool97
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alright so. sinxcospi/2+cosxsinpi/2

AravindG
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yep

AravindG
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sin pi/2= ...
cos pi/2=....

primeralph
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?

Catsarecool97
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sin=1
cos=0?

Catsarecool97
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I'm confused now

AravindG
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yes

primeralph
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You know the formula. Use the formula?

AravindG
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sin pi/2=1
cos pi/2=0

AravindG
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Put the vales there

AravindG
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*values

AravindG
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sinxcospi/2+cosxsinpi/2

Catsarecool97
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so sinxcos0+cosxsin1?

Catsarecool97
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how does this equal cos?

AravindG
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sinx *0+cosx *1=....

primeralph
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dw:1372182809686:dw

Catsarecool97
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oh! Thank you both!

AravindG
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yw :)