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THESE ARE VERY SIMILAR TO ORIGINAL BITSAT STANDARD [ I'm serious ]
Please DON'T DO these questions by ELIMINATION / SUBSTITUTION ..please give a valid reply with steps..it will be helpful to all BITSAT aspirants
1.If cos α = 12 (x+1x) and cos β = 12 (y+1y) , then cos (α-β) =
[A] xy+yx
[B] xy+1xy
[C] 12(xy+yx)
[D] None of these
Answer given : [C]
2.The two adjacent sides of a cyclic quadrilateral are 2 and 5 and the angle between them is 60°.If the third side is 3 , the remaining fourth side will is
[A] 2
[B] 3
[C] 4
[D] 5
Answer given : [A]
3.If sin xa=cos xb=tan xc= k
then bc+1ck+ak1+bk is equal to :
[A] k(a+1a)
[B] 1k(a+1a)
[C] 1k2
[D] ak
Answer given : [B]
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6 Answers
1Thanks a lot Sindhu..can u and others help me with the other ques also ??
1i thnk u shuld try Q3) like this
sinxa = cosxb = tanxc = k
212) use this formula for a triangle ABC-
cosA=b2+c2-a22bc and the fact that for cylic quadrilateral opposite angle are supplementary.
=k
