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If A+B+C=(pi)/2, " then " sum (cos (B+C)...

If `A+B+C=(pi)/2, " then " sum (cos (B+C))/(cos B cos C)= `

A

1

B

2

C

3

D

4

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The correct Answer is:
B
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AAKASH SERIES-COMPOUND ANGLES-EXERCISE - II
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  2. Tan (A-B) + Tan (B-C) + Tan (C-A)

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  3. If A+B+C=(pi)/2, " then " sum (cos (B+C))/(cos B cos C)=

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  4. If alpha + beta + lambda = (pi)/(2) and cot alpha, cot beta, cot lamb...

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  5. If Sin x Cosy = 1/4 and 3Tanx = 4 Tany then Sin (x - y) =

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  6. If Cot A Cot B = 2 & Cos (A+B) = 3/5 then Sin A Sin B

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  7. If cos (A-B)=3//5 and tan A tan B=2 , then which one of the following...

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  8. Prove that sin^(2)alpha + cos^(2) (alpha + beta) + 2 sin alpha sin bet...

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  9. sin A + sin B = sqrt(3) ( cos B- cos A )implies sin 3A + sin 3B=

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  10. If (CosA)/(CosB)=nand(SinA)/(SinB)=m then (m^(2) - n^(2)) Sin^(2) B =

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  11. If tan A=(x sin B)/(1- x cos B) and tan B=(y sin A)/(1-y cos A) then ...

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  12. If tan beta =(n tan alpha )/(1+(1-n) tan^(2) alpha ), then tan(alpha-...

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  13. If sin (120^(@) - alpha) = sin (120^(@) - beta) and 0 lt alpha,beta lt...

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  14. If 2 tan A + cot A = tan B , then cot A +2 tan (A-B)=

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  15. In a Delta ABC , if the angle C is obtuse, then tan A ta B =

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  16. In a triangle ABC, fi Tan A + Tan B + Tan C = 6 and Tan A Tan B = 2 th...

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  17. In Dleta ABC if Tan B = (2Sin ASinC)/(Sin(A+C)) then TanA, TanB, TanC ...

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  18. In a triangle ABC, If cot A+ cotB +cot C=sqrt3, then show that the tri...

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  19. Tan A + Tan B + Tan C - (sin(A+B+C))/(cosAcosBcosC)=

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  20. Statement-I : If 0 lt alpha, beta lt pi/4, sin alpha =a/sqrt(1+a^(2)),...

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