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Sakthivel

· started a discussion

· 1 Months ago

Incomplete question (Question: 351497.0 )

1/x is missing

Question:

If  \(x +\cfrac{1}{x}\)= 2 cos α, then what is the value of \(x^2+\cfrac{1}{x^2}\) ?

Options:
A)

4 cos2 α

B)

4 cos2 α – 1

C)

2 cos2 α – 2 sin2 α

D)

cos2 α – sin2 α

Solution:

Ans: (c)

  

Knowledge Expert

· commented

· 1 Months ago

Dear Student,
We rectified the mistake in the question.
Now you can check it.
Sorry for the inconvenience caused.

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