(A) Given that $\sec \theta = 1$.We know that $\sec \theta = \frac{1}{\cos \theta}$.Therefore,$\frac{1}{\cos \theta} = 1$,which implies $\cos \theta =

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(A) Given that $\sec \theta = 1$.We know that $\sec \theta = \frac{1}{\cos \theta}$.Therefore,$\frac{1}{\cos \theta} = 1$,which implies $\cos \theta = 1$.Since $\cos 0^{\circ} = 1$,we have $\theta = 0^{\circ}$.

Class 10 Mathematics Introduction to Trigonometry Mix Examples - Introduction to Trigonometry

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If $\sec \theta = 1$,then $\theta = \ldots \ldots \ldots$ (in $^{\circ}$)

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$45$
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$60$
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$90$

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Mix Examples - Introduction to Trigonometry

$(\sin 80^{\circ} + \cos 10^{\circ})(\sin 80^{\circ} - \cos 10^{\circ}) = \ldots \ldots \ldots$

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Show that $\tan ^{4} \theta+\tan ^{2} \theta=\sec ^{4} \theta-\sec ^{2} \theta$

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If $A = 30^{\circ}$,then the value of $\cos 2A$ is $\ldots \ldots \ldots . .$

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Write 'True' or 'False' and justify your answer.
The value of the expression $(\cos^{2} 23^{\circ} - \sin^{2} 67^{\circ})$ is positive.

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The value of $\tan 15^{\circ}$ and $\ldots \ldots \ldots \ldots$ are equal.

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If $\sec \theta = 1$,then $\theta = \ldots \ldots \ldots$ (in $^{\circ}$)

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$(\sin 80^{\circ} + \cos 10^{\circ})(\sin 80^{\circ} - \cos 10^{\circ}) = \ldots \ldots \ldots$

Show that $\tan ^{4} \theta+\tan ^{2} \theta=\sec ^{4} \theta-\sec ^{2} \theta$

If $A = 30^{\circ}$,then the value of $\cos 2A$ is $\ldots \ldots \ldots . .$

Write 'True' or 'False' and justify your answer.The value of the expression $(\cos^{2} 23^{\circ} - \sin^{2} 67^{\circ})$ is positive.

The value of $\tan 15^{\circ}$ and $\ldots \ldots \ldots \ldots$ are equal.

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Write 'True' or 'False' and justify your answer.
The value of the expression $(\cos^{2} 23^{\circ} - \sin^{2} 67^{\circ})$ is positive.