Recommended Questions
- cos(pi/4 +x) + cos(pi/4 -x) = sqrt(2) cos x
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- Prove that cos(pi/4+x)+cos(pi/4-x)=sqrt(2)cosx.
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- Prove that: cos((3pi)/4+x)-cos((3pi)/4-x)=-sqrt(2)sinx
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- If pi < x < 2pi, prove that (sqrt(1+cosx)+sqrt(1-cosx))/(sqrt(1+...
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- Prove that: cos(pi/4+x)+cos(pi/4-x\ )=sqrt(2)cosx
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- Prove that: cos((3pi)/4+x)-cos((3pi)/4-x\ )=sqrt(2)sinx
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- Prove that: cos((3pi)/4+x)-cos((3pi)/4-x)=-sqrt(2)sinx
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- Prove that: cos(pi/4+x)+cos(pi/4-x)=sqrt(2)\ cos x
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- cos x-sin x = sqrt (2) cos (x + (pi) / (4))
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