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Joint Entrance Examination
Mathematics
Inverse Trigonometric Functions
Question 120
Question 120 of 155
Medium
MCQ
If x = sin-1(sin10) and y = cos-1(cos10), then y - x is equal to :
A
0
B
10
C
7\[\pi \]
D
\[\pi \]
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Official solution
x = sin-1 sin 10 = 3\[\pi \] - 10 y = cos-1cos 10 = 4\[\pi \] - 10 y - x = (4\[\pi \] - 10) - (3\[\pi \] - 10) = \[\pi \]
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