In which one the following country, Hybrid rice for commercial production was first evolved?
First time in word, China developed hybrid rice in 1974. It was developed by Prof. Long Ping Yuan, known as Father of Hybrid Rice. India is second to develop hybrid rice after China.
If θ is a positive acute angle and cos² θ + cos⁴θ = 1, then the value of tan²θ + tan⁴θ is?
Evaluate, tan 17° tan 32° + tan 32° tan 41° + tan 41° tan 17° =?
Find the value of `1/2` cosec 10 - `2/(cosec 70)` ?
If 2y . cos θ - x . sin θ = 0 and 2x . sec θ - y . cosec θ = 3, what is the value of x² + 4y²?
cos A (sec A – cos A) (cot A + tan A) = ?
If √3 tan 2θ – 3 = 0, then find the value of tanθ secθ – cosθ where 0 < θ < 90°
The maximum value of 15 sin2 θ + 8 cos2 θ is