What is the value ofLsin 34Â^@ cos 236 -sin 56Â^@ sin 124Â^@COs 28Â^@ cos 88Â^@+ cos 178Â^@ sin 208Â^@(a) -2124(b) -1(c) 2(90(d) 1

What is the value of (sin34^@cos236^@-sin56^@sin124^@)/(cos28^@cos88^@+cos178^@sin208^@)

Prove that sin 10° + sin 20° + sin 40° + sin 50°=sin 70° + sin 80

Prove that sin 10° + sin 20° + sin 40° + sin 50°=sin 70° + sin 80

the vaule of arg (x) when x lt 0 is (a) 0 (b) π /2 (c) π (d) none of these

 (2sec theta + 3 tan theta + 5 sin theta -7cos theta + 5) / (2tan theta + 3 sec theta + 5 cos theta + 7sin theta + 8) = (a) tan (theta / 2)  c  (ceta (theta / 2)                                (c) sec (theta / 2)         (d)     cosec (theta / 2)      Â

The set of values of sec^(-1)(1/2) is "……….."

The set of values of sec^(-1)(1/2) is "……….."

Following frequency distribution given the weights of 38 students of a class: Weight in Kg: 31-35 36-40 41-45 46-50 51-55 56-60 61-65 66-70 71-75 No. of students9 5 14 3 1 2 2 1 1 Find the probability that weight of a student in the class is: (i)at most 60 kg (ii)at least 36 kg (iii)not more than 50kg. Also define two events in this context, one having probability 0 and the other having probability 1.

"If " C_(0),C_(1),C_(2)………C_(n) are the binomial coefficient in the expansion of (1+x)^(n) then prove that: C_(0)^(2)+C_(1)^(2)+C_(2)^(2)+……..+C_(n)^(2)=(|ul2n)/(|uln|uln)