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If `Sin^-1x+Sin^-1y+Sin^-1z=(3pi)/2,` Then Write the Value Of X + Y + Z.

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Question

If `sin^-1x+sin^-1y+sin^-1z=(3pi)/2,`  then write the value of x + y + z.

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Solution

`sin^-1x+sin^-1y+sin^-1z=(3pi)/2`

`=>sin^-1x+sin^-1y+sin^-1z=pi/2+pi/2+pi/2`     [As the maximum value in the range of `sin^-1x    is  pi/2`   And here sum of three inverse of sine is 3 times  `pi/2`.  i.e., every sin inverse function is equal to  `pi/2` here.]

`=>sin^-1x=pi/2,sin^-1y=pi/2andsin^-1z=pi/2`

`=>x=1,y=1andx=1`

`thereforex+y+z=1+1+1=3`

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Chapter 3: Inverse Trigonometric Functions - Exercise 4.15 [Page 116]

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R.D. Sharma Mathematics Volume 1 and 2 [English] Class 12
Chapter 3 Inverse Trigonometric Functions
Exercise 4.15 | Q 3 | Page 116
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