How do you evaluate $\arcsin (0)$ without a calculator?
Answer
626.4k+ views
Hint: The arcsine is the inverse of the trigonometric representation of sine. The range of arcsine is from negative of $\dfrac{\pi }{2}$ to positive of $\dfrac{\pi }{2}$. The domain of arcsin is from negative 1 to positive 1. It is a bijective function, which means it will be invertible. This property will be very useful in this question.
Complete step by step solution:
According to the question, we have to find the value of ${\sin ^{ - 1}}(0)$,
So, let ${\sin ^{ - 1}}(0)$=x
Now,
Let us draw a triangle with $\sin x$= $0$
In this right-angled triangle,
We have considered the angle between base and Hypotenuse as x.
The angle between the base and the height = $90 ^{\circ}$
Now taking sine function both sides we will get,
$\sin ({\sin ^{ - 1}}(0)) = \sin (x)$
And as we know that $\sin ({\sin ^{ - 1}}\theta ) = \theta $, if$\theta $ is from negative one to positive one, so in the equation $\theta = (0)$
Hence, the equation changes to $\sin (x) = 0$
So, as we know the value of $\sin \theta $ for different values of $\theta $, we know that when $\theta = 0$ or $\theta = \pi $ $\sin \theta $ will give the value $0$.
Hence now we know that for getting a result equal to zero, we must give input as $\theta = 0$ or $\theta = \pi $
But, the range of arcsine is from $ - \dfrac{\pi }{2}$ to $\dfrac{\pi }{2}$, but only one result in inside this range, that is $\theta = 0$, but $\theta = \pi $ is outside the range, so it will not be considered.
So, our answer is $x = 0$.
Note:
The arcsine is the inverse of a tan trigonometric function. It is a bijective function, that is, it gives a unique value of every unique input and for every output one single input is considered. Bijective also means it is invertible, that is why we changed arsine to sin easily in our solution. This property is valid only for its respective domain, which is from a negative one to a positive one.
Complete step by step solution:
According to the question, we have to find the value of ${\sin ^{ - 1}}(0)$,
So, let ${\sin ^{ - 1}}(0)$=x
Now,
Let us draw a triangle with $\sin x$= $0$
In this right-angled triangle,
We have considered the angle between base and Hypotenuse as x.
The angle between the base and the height = $90 ^{\circ}$
Now taking sine function both sides we will get,
$\sin ({\sin ^{ - 1}}(0)) = \sin (x)$
And as we know that $\sin ({\sin ^{ - 1}}\theta ) = \theta $, if$\theta $ is from negative one to positive one, so in the equation $\theta = (0)$
Hence, the equation changes to $\sin (x) = 0$
So, as we know the value of $\sin \theta $ for different values of $\theta $, we know that when $\theta = 0$ or $\theta = \pi $ $\sin \theta $ will give the value $0$.
Hence now we know that for getting a result equal to zero, we must give input as $\theta = 0$ or $\theta = \pi $
But, the range of arcsine is from $ - \dfrac{\pi }{2}$ to $\dfrac{\pi }{2}$, but only one result in inside this range, that is $\theta = 0$, but $\theta = \pi $ is outside the range, so it will not be considered.
So, our answer is $x = 0$.
Note:
The arcsine is the inverse of a tan trigonometric function. It is a bijective function, that is, it gives a unique value of every unique input and for every output one single input is considered. Bijective also means it is invertible, that is why we changed arsine to sin easily in our solution. This property is valid only for its respective domain, which is from a negative one to a positive one.
Recently Updated Pages
10 examples of friction in our daily life

Write structures of the following compounds i 2 Chloro3methylpentane class 11 chemistry CBSE

What is BLO What is the full form of BLO class 8 social science CBSE

Explain the Treaty of Vienna of 1815 class 10 social science CBSE

A Paragraph on Pollution in about 100-150 Words

XIX+XXX A 49 B 51 C 55 D 44 class 5 maths CBSE

Trending doubts
Find the value of the expression given below sin 30circ class 11 maths CBSE

What do you mean by retardation What is its SI uni class 11 physics CBSE

Draw a diagram of nephron and explain its structur class 11 biology CBSE

Difference between physical and chemical change class 11 chemistry CBSE

What are derived physical quantities Give any two examples class 11 physics CBSE

Which of the following is a derived physical quantity class 11 physics CBSE

