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Ujjal Chatterjee

· started a discussion

· 1 Months ago

??????? (Question: 394546.0 )

What?

Question:

  

Options:
A)

2

B)

23    

C)

3    

D)

-2

Solution:

Ans: (b)


Knowledge Expert

· commented

· 1 Months ago

Dear Student,

Solution is correct,

2x cot 15 /(cot^2+1)= {2x /tan 15} /( 1/tan^2 +1)
if we simplify expression we get
= 2x tan 15 degree /(1+tan^2 15) it is formula of sin 2x in the form of tan X.

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