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प्रश्न
The value of cos2 17° − sin2 73° is
विकल्प
1
\[\frac{1}{3}\]
0
-1
उत्तर
We have:
`cos^2 17°-sin^2 73°`
= `cos^2(90°-73°)-sin^2 73°`
=` sin^2 73°-sin^2 73°`
= 0
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