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Q.

Find the value of cot 70° + 4 cos 70°

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a

2 

b

  3  

c

0 

d

5 

answer is B.

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Detailed Solution

we have a = cot 70° + 4 cos 70°
⇒  a =cot (90o – 20o) + 4 cos (90o – 20o)
⇒  a =tan 20o + 4 sin 20o Question ImageQuestion ImageQuestion ImageUsing cos C + cos D = 2 cos(C+D)2sin(C-D)2 
Question Image Question Image 
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