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Two polaroids are kept crossed to each other. If one of them is rotated an angle `60°`, the perce
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`C_(6)H _(5)-NO_(2) underset(NH_4Cl) oversettext(Zn dust) rightarrow A underset(conc. HCl) oversette
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` int_(0)^(pi//2) sin 2x . log tan x dx` is equalto
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Two points masses, m each carrying charges `-q` and `+q` are attached to the ends of a massless ri
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` lim_(x->pi//4) (tan x-1)/(cos 2x)` is equa1 to
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The resistance of a germanium junction diode whose `V- I` is shown in figure is
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