8. Introduction to Trigonometry
medium

बताइए कि निम्नलिखित कथन सत्य हैं या असत्य। कारण सहित अपने उत्तर की पुष्टि कीजिए।

$(i)$ $\cos A ,$ कोण $A$ के $cosecant$ के लिए प्रयुक्त एक संक्षिप्त रूप है।

$(ii)$ $\cot A , \cot$ और $A$ का गुणनफल होता है।

$(iii)$ किसी भी कोण $\theta$ के लिए $\sin \theta=\frac{4}{3}$

Option A
Option B
Option C
Option D

Solution

$(iii)$ Abbreviation used for cosecant of angle $A$ is cosec $A$. And $\cos A$ is the abbreviation used for cosine of angle $A$

Hence, the given statement is false.

$(iv)$ cot $A$ is not the product of cot and $A$. It is the cotangent of $\angle A$.

Hence, the given statement is false.

$(v)$ $\sin \theta=\frac{4}{3}$

We know that in a right-angled triangle,

$\sin \theta=\frac{\text { Side opposite to } \angle \theta}{\text { Hypotenuse }}$

In a right-angled triangle, hypotenuse is always greater than the remaining two sides. Therefore, such value of $\sin \theta$ is not possible.

Hence, the given statement is false

Standard 10
Mathematics

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