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OpenStudy (onepieceftw):
Prove: cos θ - cos θ•sin^2 θ = cos^3 θ. Can someone walk me through this?
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OpenStudy (anonymous):
sin^2 +cos^2 =1 => sin^2=1-cos^2
OpenStudy (er.mohd.amir):
take co common and 1-sin^2 x=cos^2x
OpenStudy (anonymous):
cos - cos *(1-cos^2)=cos-cos +cos^3=cos^3
OpenStudy (onepieceftw):
Okay so sin^2 = 1-cos^2?
OpenStudy (anonymous):
yes
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OpenStudy (onepieceftw):
Thank you so much!
OpenStudy (anonymous):
YW
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