Q.
The value of cot70∘+4cos70∘is
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a
13
b
3
c
23
d
12
answer is B.
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Detailed Solution
cot70∘+4cos70∘=cos70∘+4sin70∘cos70∘sin70∘=cos70∘+2sin140∘sin70∘=cos70∘+2sin180∘−40∘sin70∘=sin20∘+sin40∘+sin40∘sin70∘=2sin30∘cos10∘+sin40∘sin70∘=sin80∘+sin40∘sin70∘=2sin60∘cos20∘sin70∘=3
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