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OpenStudy (anonymous):
trigonometry
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OpenStudy (anonymous):
What about it?
OpenStudy (anonymous):
i need help with exercise
OpenStudy (anonymous):
Write it down.
OpenStudy (anonymous):
ok
OpenStudy (anonymous):
\[cosx=\sin ^{2}x\]
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OpenStudy (anonymous):
\[cosx=1-cos^2x\] \[y=1-y^2\] \[y^2+y-1=0\]
OpenStudy (anonymous):
Now solve this quadratic equation.
OpenStudy (anonymous):
D=5
OpenStudy (anonymous):
\[cosx=\sin ^{2}x\]
OpenStudy (anonymous):
ok
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