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Cos²30° + cos²60° + cos²90° + 2 cos 30° cos 60° cos 90°​
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Cos²30° + cos²60° + cos²90° + 2 cos 30° cos 60° cos 90°​

User Stuart Thompson
by
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4 votes

Answer:

1

Explanation:


cos²30° + cos²60° + cos²90°\\ + 2 cos 30° cos 60° cos 90° \\ \\ = \bigg( ( √(3) )/(2) \bigg) ^(2) + \bigg( ( 1 )/(2) \bigg) ^(2) + \bigg( 0\bigg) ^(2) \\ + 2 * ( √(3) )/(2) * ( 1 )/(2) * 0 \\ \\ = (3)/(4) + (1)/(4) + 0 + 0 \\ \\ = (3 + 1)/(4) \\ \\ = (4)/(4) \\ \\ = 1

User John Rice
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