Question
sin2 7 ° + sin2 8 ° +
sin2 9 ° + sin2 10 ° + ……… + sin2 83 ° = ?Solution
sin2 7 ° + sin2 8 ° + sin2 9 ° + sin2 10 ° + ……… + sin2 83 ° = (sin 2 7 ° + sin2 83 °)+(sin2 8 ° + sin2 82 °) + .…. + (sin2 44 ° + sin2 46 °) + sin2 45 ° = (sin2 7 ° + cos2 7 °)+(sin2 8 °+ cos2 8 °) + .…. + (sin2 44 ° + cos2 44 °)+ sin2 45 °  {As sin (90 ° - θ) = cos θ} = (1)+(1) + .…. upto 38 times + sin2 45 ° { As sin2 θ + cos2 θ= 1} = 38 + sin2 45 °                 = 38 + (1/√2)2 {As sin 45 ° =1/√2 } = 38 + 
 = 38.5
Which of the following is not a function of Auxin?
Which one of the following is variety of triticale
When all people at all times have physical and economic access to adequate, safe and nourishing food to meet their nutritional needs and food preference...
The downward entry of water into the soil is known as
The yearly sequence and spatial arrangement of crops or of crops and fallow on a given area is known asÂ
Pusa Betakesari is a variety of ________ released by ICAR in 2015-16.
The process of separating lint from seed in cotton is called ___
Which of the following hormones is associated with the reduction of plant growth?
Excess water form precipitation that moves out of field and find ways to river, lakes and oceans is called?
Which of the following is non-edible oilseed?
