The Value of Cos2 17° − Sin2 73° is - Mathematics

Question

The value of cos² 17° − sin² 73° is

Options

1
$\frac{1}{3}$
0
-1

MCQ

Solution

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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Trigonometric Ratios of Complementary Angles

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Q 11 Q 10 Q 12

Chapter 10: Trigonometric Ratios - Exercise 10.5 [Page 57]

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Chapter 10 Trigonometric Ratios
Exercise 10.5 | Q 11 | Page 57

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The Value of Cos2 17° − Sin2 73° is - Mathematics

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