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teachoo.com
Evaluate: 2 tan^2 45° + cos^2 30° - sin2 60° [with Video] - Teachoo
Ex 8.2, 1Evaluate the following :(ii) 2 tan2 45° cos2 30° – sin2 60°We know that, tan 45° = 1cos 30° = √3/2sin 60° = √3/2Putting all values2tan 2 45° cos2 30° -= sin2 60°= 2 ×(𝟏)𝟐 (√𝟑/𝟐)^𝟐−(√𝟑/𝟐)^𝟐= 2 0 = 2
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