Day 279: NDA Maths

1. A.
   $-\tan\alpha\cdot\tan 2\alpha$
2. B.
   $-\cot\alpha\cdot\cot 2\alpha$
3. C.
   $\tan\alpha\cdot\tan 2\alpha$
4. D.
   $\cot\alpha\cdot\cot 2\alpha$

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1. A.
   $\sec 4\alpha$
2. B.
   $\csc 4\alpha$
3. C.
   $2\sec 4\alpha$
4. D.
   $2\csc 4\alpha$

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1. A.
   $\frac{pq}{p+q}$
2. B.
   $\frac{p+2q}{p}$
3. C.
   $\frac{p}{p+2q}$
4. D.
   $\frac{p}{2p+q}$

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1. A.
   $\frac{1}{2}\sqrt{26}$ square units
2. B.
   $\frac{1}{2}\sqrt{27}$ square units
3. C.
   $\sqrt{26}$ square units
4. D.
   $\sqrt{27}$ square units

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1. A.
   5
2. B.
   4
3. C.
   3
4. D.
   2

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1. A.
   (A) and (B) only
2. B.
   (B) and (C) only
3. C.
   (A) and (C) only
4. D.
   (A), (B) and (C)

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1. A.
   $1+2n$
2. B.
   $1+2n^{2}$
3. C.
   $1+n^{2}$
4. D.
   $1+4n$

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