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If ABC is a triangle, then prove that a...

If ABC is a triangle, then prove that ` abs[[tanA,1,1],[1,tanB,1],[1,1,tanC]]=2`

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USHA PUBLICATION-MODEL QUESTION SET-MODEL QUESTION SET
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  2. If [(3,-2),(5,1)][(x),(y)]=[(12),(7)], then find xand y.

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  3. If ABC is a triangle, then prove that abs[[tanA,1,1],[1,tanB,1],[1,1,...

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  4. If sqrt(1-x^(2))+sqrt(1-y^(2))=a(x-y) , then prove that (dy)/(dx)=sqrt...

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  10. Solve dy/dx+y/x=xy^2.

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  12. Prove that the measure of the angle between two main diagonals of a cu...

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