Question

9. Evaluate : 2 tan245° + cos230° - sin2600
$2 tan ^{2} 45 ^{0} + \cos ^{2} 30 ^{0} - \sin ^{2} 60 ^{0}$
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Answer 1

Answer:

2tan²45° + cos²30° - sin²60°

= 2 × 1² + (√3/2)² - (√3/2)²

= 2