Exams › JEE Main › Maths
Let x and y be real numbers such that sin(x)/sin(y) = 3 and cos(x)/cos(y) = 1/2. The value of sin(2x)/sin(2y) + cos(2x)/cos(2y) can be written as p/q where p and q are coprime positive integers. Find p + q.
- 105
- 106
- 107
- 108
Correct answer: 107
Solution
The first ratio simplifies immediately by the double angle identity. The second ratio requires finding sin²(y) from the constraint that sin²(x)+cos²(x)=1.
Related JEE Main Maths questions
- For a natural number n, the polynomial fₙ(x) of degree n is defined by fₙ(cos(theta)) = cos(n*theta). Given f₂(x) = 2x² - 1 and f₃(x) = 4x³ - 3x, if f₆(x) = p*x⁶ + q*x⁴ + r*x² + s, find the value of 7*(p + q + r - s).
- The ratio of the area of a regular n-sided polygon circumscribed about a circle to the area of the regular n-sided polygon inscribed in the same circle is 4:3. Find the value of n.
- Let A be the set {(n, 2n): n ∈ N} and let B be the set {(2n, 3n): n ∈ N}. What is the intersection A ∩ B?
- Let set A contain 3 elements and set B contain 6 elements. Then the cardinality of their union must satisfy
- Given the sets A = {1, 2, 5} and B = {3, 4, 5, 9}, what is A ∩ B?
- At a conference with 100 attendees, 29 are Indian women and 23 are Indian men. Among the Indian attendees, 4 are doctors, and 24 are either men or doctors. If there are no foreign doctors, how many foreigners and how many women doctors are present at the conference?
⚔️ Practice JEE Main Maths free + battle 1v1 →