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catgirl17

  • 3 years ago

evaluate the expression without using a calculator. (cos 30)^2 - (sin 30)^2

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  1. psi9epsilon
    • 3 years ago
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    is 30 in radians or degrees

  2. catgirl17
    • 3 years ago
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    degress

  3. catgirl17
    • 3 years ago
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    degrees

  4. psi9epsilon
    • 3 years ago
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    use double angle formulas\[\cos (30)^2-\sin(30)^2=\cos(2*30)=\cos(60)=0.5\]

  5. psi9epsilon
    • 3 years ago
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    does that help

  6. catgirl17
    • 3 years ago
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    yes

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