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((sin2A)/(secA-1))((sec2A)/(sec2A+1))=...

`((sin2A)/(secA-1))((sec2A)/(sec2A+1))=`

A

`"Tan"A/2`

B

`-"Tan"A/2`

C

`"cot"A/2`

D

`-"Tan"A/2`

Text Solution

Verified by Experts

The correct Answer is:
C
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AAKASH SERIES-MULTIPLE & SUBMULTIPLE ANGLES-EXERCISE-II
  1. ((sin2A)/(secA-1))((sec2A)/(sec2A+1))=

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  2. (sinx)/(sin(x/8))=

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  3. If sinA+sin2A=x, cosA+cos2A=y then cosA=

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  4. If 0^(@)ltthetalt180^(@) then sqrt(2+sqrt(2+sqrt(2+......sqrt(2(1+co...

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  5. If pi ltthetalt(3pi)/2 the expression sqrt(4sin^(4)theta+sin^(2)2the...

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  6. If (x^(2)+1)/(2x)=cos theta then (x^(6)+1)/(2x^(3))=

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  7. (cot x)/(cotx-cot3x)+(tanx)/(tanx-tan3x)=

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  8. If piltxlt2pi then (sqrt(1+cosx)+sqrt(1-cosx))/(sqrt(1+cosx)-sqrt(1-co...

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  9. Find the value of (sqrt(1+sin 2A)+sqrt(1-sin 2 A))/(sqrt(1 + sin 2A)-s...

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  10. If sin alpha + sin beta = a , cos alpha + cos beta = b " then cos ( ...

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  11. If "cosec" theta = (p+q)/(p-q) " then " cot((pi)/4+( theta )/(2))=

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  12. If (tan3A)/(tanA)=arArr (sin3A)/(sinA)=

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  13. tan x+ tan(x+(pi)/(3))+ tan(x+(2pi)/(3))=3impliestan 3 x=

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  14. If 0lttheta ltpi/2,sin2theta=cos3theta then sintheta=

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  15. If cos x= tan y , coty= tan z , cot z= tan x then sin x=

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  16. (cos^(3)21^(@)+cos^(3)39^(@))/(cos21^(@)+cos39^(@))=

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  17. If cos alpha = (3)/(5) , cos beta =(5)/(13) , "then " cos^(2) ((alpha...

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  18. If cosA+cosB+cosC=0=sinA+sinB+sinC then cos^(2)((A-B)/2)=

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  19. If sin(pi cos theta)=cos(pi sin theta) then sin2theta=

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  20. 2 sin^(2) beta + 4 cos( alpha+ beta) sin alpha sin beta + cos ( 2 alph...

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