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monika

· started a discussion

· 1 Months ago

method (Question: 368381.0 )

solve x and y=45 degree

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) 

  

Knowledge Expert

· commented

· 1 Months ago

Dear Student ,
You can definitely use shortcut approach.
Here we have provided general approach to solve the given problem.

Thanks and Regards
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