(A) We evaluate each option:$A$: $\cos 5 \pi = -1$ and $\cos 4 \pi = 1$. Since $-1 \neq 1$,this statement is incorrect.$B$: $\sin 2 \pi = 0$ and $\sin

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(A) We evaluate each option:$A$: $\cos 5 \pi = -1$ and $\cos 4 \pi = 1$. Since $-1 \neq 1$,this statement is incorrect.$B$: $\sin 2 \pi = 0$ and $\sin (-2 \pi) = 0$. This is correct.$C$: $\sin 4 \pi = 0$ and $\sin 6 \pi = 0$. This is correct.$D$: $\tan 45^{\circ} = 1$ and $\tan (-315^{\circ}) = \tan (-315^{\circ} + 360^{\circ}) = \tan 45^{\circ} = 1$. This is correct.Therefore,the incorrect statement is $A$.

Class 11 Mathematics Trigonometrical Ratios, Functions and Identities Fundamental trigonometrical ratios and functions, Trigonometrical ratio of allied angles

Easy

Which of the following is not correct?

KCET 2025 All KCET

A
$\cos 5 \pi = \cos 4 \pi$
B
$\sin 2 \pi = \sin (-2 \pi)$
C
$\sin 4 \pi = \sin 6 \pi$
D
$\tan 45^{\circ} = \tan (-315^{\circ})$

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Trigonometrical Ratios, Functions and Identities

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Fundamental trigonometrical ratios and functions, Trigonometrical ratio of allied angles

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Which of the following is not correct?

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