Find the maximum value of24sin@ + 7cos@ I know the method of root of (a^2 + b^2). But how can we do it logically by converting any of the fuctions?Thanks
Seema , 8 Years ago
Grade 8
1 Answers
Vikas TU
Last Activity: 8 Years ago
let y = 24sin@ + 7cos@ ….................(1)
differentiate it w.r.t @ and equate it 0.
dy/d@ = 24cos@ + -7sin@ = 0
tan@ = 24/7 ==> sin@ = 24/25 ==> cos@ = 7/25
Now put sin@ and cos@ values in eqn. (1) = 625/25 = 25 is the answer.
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