Q36 of 123 Page 9

Mark the Correct alternative in the following:
If then b cos 2x + a sin 2x is equal to

Given

The value of the expression b cos 2x + a sin 2x

Now consider b cos 2x + a sin 2x

[ by using and ]

As already given

Then

= b

Hence b cos 2x + a sin 2x = b.

The answer is option B.

Mark the Correct alternative in the following:

is equal to

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If n = 1, 2, 3, …., then cos α cos 2 α cos 4 α … cos 2^{n – 1} α is equal to

Mark the Correct alternative in the following:

If then cos 2α is equal to

Mark the Correct alternative in the following:

The value of cos² 48^o – sin² 12^o is

Mark the Correct alternative in the following:If then b cos 2x + a sin 2x is equal to