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ABHISHEK KUMAR

· started a discussion

· 1 Months ago

abhishek (Question: 368381.0 )

itna calculative kaise rahega!

Question:

If  cos xcos y    = n and  sin xsin y    = m, then (m2 – n2) sin2y is equal to

Options:
A)

1 – n2

B)

1 + n2

C)

m2

D)

n2

Solution:

Ans:(a) 

  

Karan

· commented

· 1 Months ago

bhai x=y krke ... m=n=1 ... then find krna hai m sq. - n sq. = 0... only 1 - n sq. comes out to be 0.. hence our rqd solutn

Yashwanth Anil Kumar

· commented

· 1 Months ago

I too have same feelings

Knowledge Expert

· commented

· 1 Months ago

Dear student,
This type of a question introduce to make aware different types of question,
Its your own profit.

Keep learning keep solving
Team TR

ujjwal pandey

· commented

· 1 Months ago

put x=60 and y=30
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