If 3 cos A = 4 sin A; find the value of :
4 cos2 A - 3 sin? A + 2
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right your questions clear..........
If 3 cos A= 4sinA, find the value of 4cos²A - sin² A+2....
it is a right question......
answer....
3cosA = 4sinA,
tanA = 3/4
sinA = 3/5 & cosA = 4/5
putting the value
= 4cos²A - 3sin²A + 2
= 4×(4/5)² - 3×(3/5) ² +2
= 4×16/25 - 3×9/25 +2
= 64/25 - 27/25 +2
=64-27+50/25
=87/25 ans.
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