Question
An effective method to prevent nematode infestation when
it is not yet present in the area?Solution
 Crop rotation is one of the oldest and most economical methods of controlling nematodes. Rotation is simply the practice of not growing a susceptible host in the same site for more than one year.
- If cos2B = sin(1.5B - 36 o ) , then find the measure of 'B'.
If sin(x + y) = 1 and sin(x - y) = (1/2), then what is the value of sinx cosx + 2sin2y + cos2y?Â
cos (sec-1 x) is equal to –
If 2x = cosec @ and 4/x = cot @ then the value of 2(x ² - 1/x ² ) is


The minimum value of 9 cos2 θ + 36 sec2 θ isÂ
If (1+sinθ)/cosθ = x, then find the value of secθ?
1.Â
If (sinx + siny) = a and (cosx + cosy) = b, then find the value of (sinx siny + cosx cosy).
[A] (a²+b²-2)/ 2
[B] (a2-b2<...
- Find the value of sin²40° + sin²50° + cos²60° + cos²30°.