[cos25°−sin65°]/ [cos25°+sin65°]. Use the identity sin 65° = cos (90° - 65°) Since sin 65°= cos 25°, the expression becomes- [cos 25° - cos 25°]/ [cos 25° + cos 25°] = 0/2cos25° =0 So, the value of the expression is 0.
In a classroom there are 12 boys and 10 girls. Average age of each boy and each girl is 22 years and 18 years respectively. The sum of ages of all the b...
A’s age is the fifth part of his father’s age. After 7 years, the age of A’s father will be twice the age of B. If B’s 6th birth...
Present age of ‘A’ is 40% more than that of ‘B’. If 10 years hence from now, ‘B’ will be 4 years younger than ‘A’, then find the sum of ...
5 years ago from now, the ratio of age of 'A' and 'B' was 9:5, respectively and 5 years hence from now, the ratio of their ages will become 11:7. Find ...
Currently, the ages of Rahul and Ritesh are in a ratio of 7:3. If we look back three years, the ages of Ritesh and Ramesh had a ratio of 1:3. Knowing th...
The current ages of A and B are in the ratio of 8:15. Eight years ago, the ratio of their ages was 6:13. What will be the ratio of their ages 8 years f...
The ratio of age of ‘B’ after 5 years from now and age of ‘C’ 4 years ago from now is 7:4, respectively. The present age of ‘C’ is 40% of th...
The current average age of three friends, Aravi, Bipasa, and Chinu, is 24 years. The ratio of Chinu's and Diksha's present ages is 4:5, and Bipasa's cur...
The ratio of the ages of A, B and C, 5 years ago, was 4 : 5 : 7. The sum of their present ages is 135 years. What will be the sum of the ages (in years...
The ratio of the present age of A to that of B is 7:9. Six years ago the ratio of 1/3 of A’s age at that time and 1/3 of B’s age at that time was 1:...
