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Anil Singh

· started a discussion

· 1 Months ago

shortcut (Question: 257147.0 )

use a^2+b^2=c^2+d^2

Question:

  .

Options:
A)

2    cos x

B)

2    cosec x

C)

2    sec x

D)

2    sin  ×    cos x

Solution:

Ans: (a)

  

ANSHUMAN PRADHAN

· commented

· 1 Months ago

how
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