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Yahoo!

  • 3 years ago

Find the period of \[f(x)) = 4 sin^2x + 7 cos^2 x\]

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  1. Ishaan94
    • 3 years ago
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    My guess is \(\pi\).

  2. Yahoo!
    • 3 years ago
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    Yup...@Ishaan94 u r correct

  3. Yahoo!
    • 3 years ago
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    Can u ....Solve this....@Ishaan94

  4. Ishaan94
    • 3 years ago
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    Period of \(b\sin^2x + a\cos^2x\) is same as \(c\sin^2x\). Use \(\sin^2\theta + \cos^2\theta = 1\).

  5. Yahoo!
    • 3 years ago
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    Did nt get u @Ishaan94

  6. Ishaan94
    • 3 years ago
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    \[4\sin^2x + 7\cos^2x = 4 - 11 \cos^2x\] Since \(\cos ^2x\)'s period \(\pi\), \(4 - 11 \cos^2x\) would \(\pi\) as well.

  7. Ishaan94
    • 3 years ago
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    ... would be* ...

  8. Yahoo!
    • 3 years ago
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    Yes...thxxxx

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