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In a classroom, a teacher explains the properties of a particular curve by saying that this…

Mathematics20254 marksCase based
In a classroom, a teacher explains the properties of a particular curve by saying that this particular curve has beautiful ups and downs. It starts and heads down until $\pi$ radian, and then heads up again and is closely related to sine function. Both follow each other at exactly $\frac{\pi}{2}$ radians apart as shown in the figure given below: Based on the above information, answer the questions that follow.
Figure for this question
(a)[1.3333333333333333]
Name the curve that the teacher explained in the classroom.
(b)[1.3333333333333333]
Find the area of the curve explained in the passage from 0 to $\frac{\pi}{2}$.
(c)[1.3333333333333333]
Find the area of the shaded region.

Answer

Answer (a)

Official answer key
cosine.

Answer (b)

Official answer key
1 sq unit.

Final answer: 1 sq unit

Answer (c)

Official answer key
$2 - \sqrt{2}$ sq. units.

Final answer: $2 - \sqrt{2}$ sq. units

Application of Integrals

From ISC 2025 Practice Mathematics, question 99.