Class 11MathematicsTrigonometric FunctionsFundamental trigonometrical ratios and functions, Trigonometrical ratio of allied angles
EasyLet $\triangle ACB$ be a triangle with a right angle at $C$. Let $AB = 29$ units,$BC = 21$ units,and $\angle ABC = \theta$. Then $\cos^2 \theta - \sin^2 \theta = $
- A$1$
- B$\frac{41}{841}$
- C$\frac{40}{441}$
- D$\frac{41}{800}$
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