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OpenStudy (anonymous):
Prove
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OpenStudy (anonymous):
(sinA+cosA)^4=1+4sinAcosA+4sin^2Acos^2
hartnn (hartnn):
[(s+c)^2 ]^2 = [......]^2
OpenStudy (anonymous):
sin^A+2sinAcosA+cos^2A
OpenStudy (anonymous):
(sin^2A+2sinAcosA+cos^2A)^2
hartnn (hartnn):
but sin^2 +cos^2 =1 this is standard!
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OpenStudy (anonymous):
oh yes!!
hartnn (hartnn):
now you'll get it
OpenStudy (anonymous):
yup got it
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