Using the identity cos(A - B) = cos A cos B + sin A sin B, cos(75° - 15°) = cos 60° = 1/2. Correct option: c
Let p be a two-digit number and q be the number consisting of same digits written in reverse order. If p × q = 2430, then what is the difference betwe...
If the order of the letters in the English alphabet is reversed and each letter represents the letter whose position it occupies, then which one of the...
In the series AABABCABCDABCDE...,which letter appears at the 100th place?
Let A, B and C represent distinct non- zero digits. Suppose x is the sum of all possible 3-digit numbers formed by A, Band C without repetition.
<...Which one of the following habits is found more often in good people ?
X said to Y, "At the time of your birth I was twice as old as you are at present." If the present age of X is 42 years, then consider the following sta...
How many 3-digit natural numbers (without repetition of digits) are there such that each digit is odd and the number is divisible by 5?
When a certain number is multiplied by 7, the product entirely comprises ones only (1111…..). What is the smallest such number ?
Integers are listed from 700 to 1000. In how many integers is the sum of the digits 10?
24 men and 12 women can do a piece of work in 30 days. In how many days can 12 men and 24 women do the same piece of work?
