If 3cosA = 4sinA; find the value of : 4cos²A - 3sin²A + 2
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1
Answer:
87/25
Step-by-step explanation:
3cosA=4sinA
sinA/cosA=3/4
tanA=3/4
therefore, sinA=3/5 & cosA=-4/5
or sinA=-3/5 & cosA=4/5
sollution is
4((4/5)^2)-3((3/5)^2)+2
=64/25-27/25+2
=37/25+2
=87/25.
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