Q.

The value of cot⁡70∘+4cos⁡70∘is

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a

13

b

3

c

23

d

12

answer is B.

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Detailed Solution

cot⁡70∘+4cos⁡70∘=cos⁡70∘+4sin⁡70∘cos⁡70∘sin⁡70∘=cos⁡70∘+2sin⁡140∘sin⁡70∘=cos⁡70∘+2sin⁡180∘−40∘sin⁡70∘=sin⁡20∘+sin⁡40∘+sin⁡40∘sin⁡70∘=2sin⁡30∘cos⁡10∘+sin⁡40∘sin⁡70∘=sin⁡80∘+sin⁡40∘sin⁡70∘=2sin⁡60∘cos⁡20∘sin⁡70∘=3
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The value of cot⁡70∘+4cos⁡70∘is