

Ex 3.3
Ex 3.3, 2 Important
Ex 3.3, 3 Important
Ex 3.3, 4 You are here
Ex 3.3, 5 (i) Important
Ex 3.3, 5 (ii)
Ex 3.3, 6 Important
Ex 3.3, 7
Ex 3.3, 8 Important
Ex 3.3, 9 Important
Ex 3.3, 10
Ex 3.3, 11 Important
Ex 3.3, 12
Ex 3.3, 13 Important
Ex 3.3, 14
Ex 3.3, 15
Ex 3.3, 16 Important
Ex 3.3, 17
Ex 3.3, 18 Important
Ex 3.3, 19
Ex 3.3, 20
Ex 3.3, 21 Important
Ex 3.3, 22 Important
Ex 3.3, 23 Important
Ex 3.3, 24
Ex 3.3, 25
Ex 3.3
Last updated at Dec. 24, 2019 by Teachoo
Ex 3.3, 4 Prove that 2sin2 3 /4 + 2cos2 /4 + 2sec2 /3 = 10 Taking L.H.S 2sin2 3 /4 + 2cos2 /4 + 2sec2 /3 Putting = 180 2 sin2 (3 180/4 ) + 2cos2 (180/4) + 2sec2 (180/3) = 2sin2 (135 )+2 cos2 (45 ) + 2sec2(60 ) Putting values = 2 sin2 (135 ) +2 cos2 (45 ) + 2sec2 (60 ) = 2 (1/ 2)^2 + 2 (1/ 2)^2 + 2 (2)2 = 2 [(1/ 2)^2 " + " (1/ 2)^2 " + 22" ] = 2 [ 1/2 + 1/2 + 4] = 2 [1 + 4] = 2 5 =10 = R.H.S L.H.S. = R.H.S. Hence proved