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The integer k for which the equation 7co...

The integer k for which the equation 7cosx+5sinx=2k+1 has a solution is

A

(-4)

B

(-2)

C

2

D

4

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The correct Answer is:
A, B, C
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PATHFINDER-TRIGONOMETRIC RATIOS AND IDENTITIES-QUESTION BANK
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  2. if sin^4alphacos^2alpha=underset(k=0)overset3sum ckcos2kalpha then c1+...

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  3. The integer k for which the equation 7cosx+5sinx=2k+1 has a solution i...

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  4. For +ve integer n, letfn(theta)=tan(theta/2)(1+sectheta)(1+sec2theta)(...

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  5. If x=secphi-tanphi and y=cosecphi+cotphi, then

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  6. If sectheta+tantheta=1 then one root of equation a(b-c)x^2+b(c-a)x+c(a...

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  7. if cosx+secx=(-2) then for a positive integer n cos^nx+sec^nx is

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  8. sec^2theta=4xy/(x+y)^2 is true if and only if

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  9. If tanx=(2b)/(a-c), (a ne c) y=acos^2x+2bsinxcosx+csin^2x and z=asin...

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  10. If secA+tanA=3/2 then

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  11. If tantheta=(sin alpha-cos alpha)/(sinalpha+cosalpha)1 then

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  12. The value of cos(pi/15)cos(2pi/15)cos(3pi/15)cos(4pi/15)cos(5pi/15)cos...

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  13. The value of cos((2pi)/7)cos((4pi)/7)cos((6pi)/7) is

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  15. If Pn=sin^ntheta+cos^ntheta where n in W (whole number)and theta in R ...

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  16. If Pn=sin^ntheta+cos^ntheta where n in W (whole number)and theta in R ...

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  17. If Pn=sin^ntheta+cos^ntheta where n in W (whole number)and theta in R ...

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  18. if f(theta)=acostheta+bsintheta then -sqrt(a^2+b^2)lef(theta)lesqrt(a^...

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  19. if f(theta)=acostheta+bsintheta then -sqrt(a^2+b^2)lef(theta)lesqrt(a^...

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  20. if f(theta)=acostheta+bsintheta then -sqrt(a^2+b^2)lef(theta)lesqrt(a^...

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