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If s e c^2theta=(4x y)/((x+y)^2) is true...

If `s e c^2theta=(4x y)/((x+y)^2)` is true if and only if (a)`x+y!=0` (b) `x=y , x!=0` (c) `x=y` (d) `x!=0,y!=0`

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ALLEN-TRIGONOMETRIC RATIOS AND IDENTITIES-All Questions
  1. If sin(alpha+beta)=1, sin(alpha-beta)=1/2 then, tan(alpha+2beta) tan(2...

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  2. If tantheta=-4/3,t h e nsintheta is -4/5b u tnot4/5 (b) -4/5or4/5 ...

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  3. If s e c^2theta=(4x y)/((x+y)^2) is true if and only if (a)x+y!=0 (b)...

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  4. If u=sqrt(a^2 cos^2 theta + b^2sin^2theta)+sqrt(a^2 sin^2 theta + b^2 ...

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  5. Let alpha and beta be such that pi<alpha-beta<3pi, If sinalpha+sinbeta...

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  6. If 0ltxltpi and cosx +sinx = 1/2 then tan x is (A) (-(4+sqrt(7))/3) (B...

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  7. Let cos(alpha+beta)""=4/5 and let sin (alpha+beta)""=5/(13) where 0lt=...

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  8. If A""=""s in^2x""+""cos^4x , then for all real x : (1) 3/4lt=Alt=1...

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  9. In a Delta PQR , if 3 sin P + 4 cos Q = 6 and 4 sin Q + 3 cos P =1, th...

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  10. The expression (tan A)/(1-cotA)+(cot A)/(1-tan A) can be written as

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  11. ABCD is a trapezium such that A B||C Da n dC B is perpendicular to the...

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  12. Let fk(x)=1/k(sin^kx+cos^kx)" where "x in R and kge1. " Then "f4(x) -f...

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  13. If m and M are the minimum and the maximum values of 4+1/2 sin^2 2x-2c...

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  14. If A >0,\ B >0\ a n d\ A+B=\ pi/6 , then the minimum value of t a n A+...

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  15. If alpha+beta=pi/2\ a n d\ beta+gamma=alpha, then t a nalpha, equals- ...

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  16. Given both thetaa n dvarphi are acute angles and sinalphabetagamma=1/2...

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  17. In an equilateral triangle, three coins of radii 1 unit each are kept ...

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  18. t1 = (sintheta)^costheta ,t2 = (sintheta)^sintheta , t3 = (costheta)^c...

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  19. If (sin^4x)/2+(cos^4x)/3=1/5t h e n tan^2x=2/3 (b) (sin^8x)/8+(cos^...

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  20. For 0ltthetalt pi/2 the solutions(s) of sum(m=1)^6 cosec (theta+ ((m-1...

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