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The value of \(2\tan^2 45° + \cos^2 30° - \sin^2 60°\) is:

  • A.1
  • B.2
  • C.3/2
  • D.1/2

Answer: B

We substitute the standard trigonometric values:

\(\tan 45° = 1\)

\(\cos 30° = \frac{\sqrt{3}}{2}\)

\(\sin 60° = \frac{\sqrt{3}}{2}\)

The expression is \(2(1)^2 + (\frac{\sqrt{3}}{2})^2 - (\frac{\sqrt{3}}{2})^2 = 2(1) + \frac{3}{4} - \frac{3}{4} = 2\).

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