- Verify sin^2(x/2)=(csc^2(x)-cot^2(x))/(2 csc^2(x)+2cscxcotx)?

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The teacher gave the exact same grade to all my friends and -.? The length of the minor arc AB of a circle, centre 'O', is 2π cm and the length of major arc is 22π cm.? Identify X in the reaction below.
X + 1n → 142Ba + 91Kr + 3 1n? How to find the roots of y=3x^2-20x-7? 0.437g of dinitrogen oxide gas and 0.55g of fluorine gas is in 1.64L vessel at 40.077C What are the mole fractions of the individual gases?