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In a right angled triangle, the hypotenu...

In a right angled triangle, the hypotenuse is four times as long as the perpendicular drawn to it from the opposite vertex. One of the acute angle is

A

`15^(@)`

B

`30^(@)`

C

`45^(@)`

D

none of these

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A
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OBJECTIVE RD SHARMA-TRIGONOMETRIC RATIOS AND IDENTITIES-Exercise
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  2. If sintheta+costheta=sqrt2costhetathen costheta-sintheta is equal to

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  3. In a right angled triangle, the hypotenuse is four times as long as th...

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  4. If theta lies in the first quardrant and costheta=(8)/( 17 ), then fi...

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  5. cos^4(pi/8)+cos^4((3pi)/8)+cos^4((5pi)/8)+cos^4((7pi)/8)=

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  6. If tan(A+B)=pand tan(A-B)=q, then the value of tan2A, is

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  7. In a triangle ABC, sin A-cosB=cosC, then angle B, is

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  8. If theta lies in the first quadrant which of the following in not true

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  9. cos2 theta+2 costheta is always

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  10. The interior angles of a polygon are in AP The smallest angle is 120 a...

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  11. The maximum and minimum values of -4le5cos theta+3cos(theta+(pi)/(3...

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  12. sin36^@sin72^@sin108^@sin144^@=5/16

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  13. If A=tan6^0tan42^0 and B=cot66^0cot78^0 , then

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  14. If sinx+cosesx=2,thensin^(n)x+cosec^(n)x is equal to

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  15. If x/acosalpha+y/bsinalpha=1, x/acosbeta+y/bsinbeta=1 and (cos alpha c...

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  16. The value of theta lying between 0 and pi/2 and satisfying |[1+sin^2th...

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  18. sqrt(3)cossec2 0^0-sec2 0^0

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  19. The equation sin^2theta=(x^2+y^2)/(2x y),x , y!=0 is possible if

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