Question

how to solve this question?

Q.20) The greatest value of 5 sin²x + 7 cos² x - 4 sin x cos x will be:

Options:
1. $6 - \sqrt{5}$
2. $6 + \sqrt{5}$
3. $- 6 + \sqrt{5}$
4. $- 6 - \sqrt{5}$

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Answer 1

Answer:

first mark me brilient

Step-by-step explanation:

then i will answer