Prove that radian should be constant

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Q. Prove that

{lim}_{θ \to 0} \frac{sin θ}{θ} = 1

where

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Q. Prove that

lim x \to 0 [\frac{sin x}{x}] = 1

where

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lim x \to 0 [\frac{sin a x}{b x}]

Q. If A be any

m \times n

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Q. If A be any

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A bar magnet of length 0.2 m and pole strength 5 A.m. should be kept in a uniform magnetic field of induction 15 tesla at angle ..... radians to the field so that the torque experienced by it will be 7.5N-m

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