Day 340: NDA Maths

1. A.
   $\cos\beta = \frac{1-\tan^2\alpha}{1+\tan^2\alpha}$
2. B.
   $\cos\beta = \frac{1+\tan^2\alpha}{1-\tan^2\alpha}$
3. C.
   $\cos\beta = \frac{2\tan\alpha}{1+\tan^2\alpha}$
4. D.
   $\sin\beta = 2\sin^2\alpha$

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1. A.
   $a > 0,\ b > 0$
2. B.
   $a < 0,\ b < 0$
3. C.
   $a > 0,\ b < 0$
4. D.
   $a < 0,\ b > 0$

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1. A.
   only one AP
2. B.
   more than one but finite numbers of APs
3. C.
   infinite number of APs
4. D.
   finite number of GPs

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1. A.
   $20-30$
2. B.
   $30-40$
3. C.
   $40-50$
4. D.
   $50-60$

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1. A.
   1 only
2. B.
   2 only
3. C.
   Both 1 and 2
4. D.
   Neither 1 nor 2

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1. A.
   38·4
2. B.
   39·4
3. C.
   40·9
4. D.
   41·6

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1. A.
   -1
2. B.
   0
3. C.
   1
4. D.
   2

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