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Start learning 50% faster. Sign in nowsin 2 17˚ + sin 2 19˚ + sin 2 21˚ + sin 2 23˚ + ……… + sin 2 77˚ = (sin2 17˚ + sin2 73˚) + (sin2 19˚ + sin2 71˚) + .…. + (sin2 43˚ + sin2 47˚) + sin2 45˚ = (sin2 17˚ + cos2 17˚) + (sin2 19˚ + cos2 19˚) + .…. + (sin2 43˚ + cos2 43˚) + sin2 45˚ {As sin (90˚ - θ) = cos θ} = (1)+(1) + .…. upto 14 times + sin2 45˚ { As sin 2 θ + cos 2 θ= 1} = 14 + sin2 45˚ {As there are 14 odd numbers from 14 to 43}. = 14 + (1/√2)2 {As sin 45˚ =1/√2 } = 14 + 0.5 = 14.5 ` ` ` ` ` ` ` ` ` ` ` `
9 × 40× 242 × 182= ?2
(115 × 17 × 3)/(23 × 51) + ?3 = √169
41.66% of 888 + 66.66% of 1176 = ?2 - 4√ 16
Find the simplified value of the given expression.
(-8) x {15 - (-4) x (-5)}
22% of 560 + 34% of 2160 × 5/12 =? + 16% of 920
25% of 1600 – 152 = ? × 5
(49 x ?) / 3.5 + 389 = 627
(180 ÷ 22 ) ÷ (60% of 30) = (? ÷ 2)