Question

What is maximum value of 3-7cos 5x

Answer 1

SOLUTION...

The value of cos x :-
-1 《 cos x 》1

So, the maximum value of cos x is 1 and minimum value of cos x is- 1.

Now, For maximum value:-
cos 5x = 1
( multiply both sides by -7)

-7cos 5x = -7
(adding 3 on both sides)

3-7cos x = -7+3
3-7cos x = -4.

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