Evaluate the following :
$co s^{2} 1 3^{\circ} - s i n^{2} 7 7^{\circ}$

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Evaluate the following :

co s^{2} 1 3^{\circ} - s i n^{2} 7 7^{\circ}

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Text solutionVerified

We have,

co s^{2} 1 3^{\circ} - s i n^{2} 7 7^{\circ} = co s^{2} (9 0^{\circ} - 7 7^{\circ}) - s i n^{2} 7 7^{\circ} = s i n^{2} 7 7^{\circ} - s i n^{2} 7 7^{\circ} = 0

[∵ cos (9 0^{\circ} - θ) = s in θ]

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Question Text	Evaluate the following : $co s^{2} 1 3^{\circ} - s i n^{2} 7 7^{\circ}$
Answer Type	Text solution:1
Upvotes	150