Without using trigonometric tables, prove that:
$cos^{2} 57^{o} - sin^{2} 33^{o} = 0$

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Without using trigonometric tables, prove that:

cos^{2} 57^{o} - sin^{2} 33^{o} = 0

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Text solutionVerified

L H S = cos^{2} 57^{o} - sin^{2} 33^{o} = cos^{2} 57^{o} - sin^{2} (90 - 57)^{o} = cos^{2} 57^{o} - cos^{2} 57^{o} = 0 = R H S

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Question Text	Without using trigonometric tables, prove that: $cos^{2} 57^{o} - sin^{2} 33^{o} = 0$
Answer Type	Text solution:1
Upvotes	150