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If sin 2A =sin 3A and 0 le A le 90^(@), ...

If `sin 2A =sin 3A and 0 le A le 90^(@), ` then A is equal to

A

`45^(@)`

B

` 60^(@)`

C

`0^(@) or 36^(@)`

D

`72^(@)`

Text Solution

Verified by Experts

The correct Answer is:
C
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TARGET PUBLICATION-TRIGONOMETRIC FUNCTIONS OF COMPOUND ANGLES -CRITICAL THINKING
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  8. If 3 sin 2 theta = 2 sin 3 theta and 0 lt theta lt pi, then sin theta ...

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  9. If sin 2A =sin 3A and 0 le A le 90^(@), then A is equal to

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  10. Solve that following equations : "tantheta"+"tan"(theta+pi/3)+"tan"(t...

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  11. If sin theta =-4/5 and theta lies in third quadrant, then the valu...

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  12. If sec theta =1 (1)/(4), then tan ""(theta)/(2)=

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  13. For for A=133^(@),2cos""A/2is equal to

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  14. If cos theta = 3/5 and cos phi =4/5, where theta and phi are positive ...

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  15. (cosalpha+cosbeta)^2+(sinalpha+sinbeta)^2=

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  16. (sin 2A)/( 1+ cos 2A) . (cos A)/( 1+ cos A)=

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  19. If 0 lt theta lt (pi)/(2) and (y+1)/(1-y) =sqrt((1+ sin theta)/( 1- si...

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  20. If tan A & tan B are the roots of the quadratic equation x^2 - ax +...

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