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MEGHSHYAM SINSINWAR

· started a discussion

· 1 Months ago

solution (Question: 271972.0 )

i cannot understand this solution

Question:

If (1 – cot 4º) (1 – cot 5º) (1 – cot 6º) …. (1 – cot 41º) = 2P, then the value of P is –

Options:
A)

17

B)

18

C)

19

D)

21

Solution:

Ans: (c)


Vijay Sharma

· commented

· 1 Months ago

apply cot(44 + 1) formula ...it will prove prove. (cot A -1)(cot B - 1) = 2 when A+B = 45 now make pairs of no.s adding up to 45.... total pairs = ( 41-4)/1 + 1 = 38 ....since 2 terms are making a single to....power of 2 will be 38/2 = 19 ....NOW LHS =RHS compare ...p = 19

MEGHSHYAM SINSINWAR

· commented

· 1 Months ago

please clear
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