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pi-π

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9	A spherical ball of salt is dissolving in water
8	The sum of digits in a 2-digit number
8	Prove: If $x+y+z=xyz$ then $\frac {x}{1-x^2} +\frac {y}{1-y^2} + \frac {z}{1-z^2}=\frac {4xyz}{(1-x^2)(1-y^2)(1-z^2)}$
8	Help with this trigonometry problem
7	Integrate $\int \frac {\sin (2x)}{(\sin x+\cos x)^2}\,dx$

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2	Prove that $\sin^4\theta+\cos^4\theta=\frac{3+\cos4\theta}{4}$
1	Please help me Prove the identity, I keep getting the same answer no matter what
1	Product of two matrices
1	Right Triangle: Given hypotenuse and ratio of legs, find legs
1	Locus of mid point of a segment

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5 trigonometry × 103	1 exponentiation
2 geometry × 51	1 inverse
1 matrices × 10	1 alternative-proof
1 fractions × 6	0 calculus × 117
1 factoring × 2	0 analytic-geometry × 87

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1	In a triangle ABC, prove that cot(A/2)+cot(B/2)+cot(C/2) =cot(A/2)cot(B/2)cot(C/2)
0	If $\frac {x}{a}=cos (\theta -\alpha)$.. Hello anyone there. Please help to solve.
0	Arithmetic Questions:

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