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- Question
For x = 462+3, what is the value of x+22x-22+x+23x-23
Options- A. 1
- B. ?2
- C. ?3
- D. 2
- Correct Answer
- 2
- 1. Consider the following for real numbers ?, ?, ? and ? ? 1) sec ? = 1/4 2) tan ? = 20 3) cosec ? = 1/2 4) cos ? = 2 How many of the above statements are not possible?
Options- A. one
- B. two
- C. three
- D. four Discuss
- 2. What is the value of sin6? + cos6? + 3 sin2? cos2? ?1 ?
Options- A. 0
- B. 1
- C. 2
- D. 4 Discuss
- 3. What is the value of sin225°+ sin265° ?
Options- A. 0
- B. 1
- C. 2
- D. 4 Discuss
- 4. If 3 tan ? = cot ? where 0 < ? < ?/2 , then what is the value of ? ?
Options- A. ?/6
- B. ?/4
- C. ?/2
- D. 1 Discuss
- 5. If p and q are the roots of the equation x2 ?15x + r = 0 and p ?q = 1, then what is the value of r ?
Options- A. 55
- B. 56
- C. 60
- D. 64 Discuss
- 6. If a : b = c : d = 1 : 6, then what is the value of a2+c2b2+d2 ?
Options- A. 1/600
- B. 1/60
- C. 1/36
- D. 1/360 Discuss
- 7. For x > 0, what is the minimum value of x + x+22x ?
Options- A. 1
- B. 2
- C. 2.5
- D. 1.5 Discuss
- 8. If 1/3(12x/5 - 1/2) + 6/5 = 7/6, then what is the value of x?
Options- A. 1/6
- B. -1/6
- C. 1/5
- D. -1/5 Discuss
- 9. If a - b = 10 and ab =-21, then what is the value of a3-b3 ?
Options- A. 316
- B. 370
- C. 185
- D. 158 Discuss
- 10. What is the reflection of the point (5, -2) in the line y = -1?
Options- A. (-7 , -2)
- B. (-5 , 0)
- C. (5 , 0)
- D. (-7 , 2) Discuss
Simplification problems
Search Results
Correct Answer: three
Explanation:
Sec of any number can never be less than 1
tan can take any value from -? to + ?
cosec of any number can never be less than 1
cos of any number can never be greater than 1
so option 1,3,4 are not possible
Correct Answer: 0
Correct Answer: 1
Correct Answer: ?/6
Explanation:
3tan ? = cot ?
3tan ? = 1/tan ?
tan2? = 1/3
tan ? = 1/?3
? = ?/6
Correct Answer: 56
Explanation:
In the below equation,
x2?15x + r = 0
sum of roots = p + q = -(-15)/1 = 15 (sum of roots for equation ax2+ bx + c is -b/a)
product of roots = pq = r/1 = r (product of roots for equation ax2+ bx + c is c/a)
given p ?q = 1
also we know that p+q = 15
subtracting the squares of both
(p+q)2 + (p-q)2 = 15^2?1
p2 + q2 + 2pq ?p2 ?q2 +2pq = 225 -1
4pq = 224
4r = 224
r = 56
Correct Answer: 1/36
Correct Answer: 2.5
Correct Answer: 1/6
Correct Answer: 370
Correct Answer: (5 , 0)
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