ATQ, We know cos(90° - A) = sin A cos² 10 + cos² 20 + cos² 30° +……. + cos² 90° = cos² 1 + cos² 20 + cos² 30° + cos² 40° + sin² 40+ sin² 30° + sin² 20 + sin² 10+ cos² 90 = (sın² 10° + cos2 10) + (sin² 20 + cos² 20) + (sin² 30° + cos² 30) + (sin² 40+ cos² 40°) + cos² 90 = 1+1+1+1+0 = 4
If {1/(y + 1) + 1/(y + 5)} = {1/(y + 2) + 1/(y + 4)}. Find the value of y
If a – b – c = 0, then the value of (a2 + b2 + c2)/(b + ac) is:
In a club of singers and dancers, 10% of the artists are absent on a particular day and 90% of the present artists are dancers. If 2,250 singers are pr...
If x + y + z = 7, x² + y² + z² = 85 and x³ + y³+ z³ = 842, then the value of√3 xyz is:
...
If x = 19 , find x 5 - 20 x 4 + 20 x 3 - 20x 2 + 20x - 20 = ?
(408 × 680)÷(20% of 680) = (250 × 260)÷ 10 + ? – 4500
1/3 + 1/15 + 1/35 + 1/63 + 1/99 = ?
In △ ABC, AB = AC. A circle drawn through B touches AC at D and intersect AB at P. If D is the midpoint of AC and AP = 2.5 cm, then AB is equal to:
