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The value of the expression sinx+ siny +...

The value of the expression `sinx+ siny + sinz` where x, y, z are real numbers satisfying `x+y+z= 180^@` is

A

Positive

B

Zero

C

`-3`

D

Negative

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The correct Answer is:
A, B, D
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AAKASH INSTITUTE-TRIGNOMETRIC FUNCTIONS -Section-C (Objective Type Questions More than one options are correct )
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  2. Which of the following identities are correct?

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  3. The value of the expression sinx+ siny + sinz where x, y, z are real ...

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  4. Let thetain(0,pi//4)and t(1)=(tantheta)^(tantheta), t(2)=(tantheta)^(...

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  5. If tan( pi/4 + x). tan(pi/4 - x) = 1 , then x equals

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  6. Find the value of tan22.5^(@)

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  7. If cos2alpha=(3cos2beta-1)/(3-cos2beta), then tan alpha is equal to

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  8. If sin alpha=-3/6, alpha in [0,2pi] then the possible values of cos (a...

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  9. f(alpha.beta) = cos^2+ beta cos^2(alpha+beta)- 2 cosalpha cosbeta cos(...

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  10. The value of cosA cos2A cos2^2A......cos(2^(n-1)A), where A in R may...

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  11. If A+B=pi/3, and cosA+cosB=1, then

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  12. cos^3x.sin2x=sum(m=1)^n(am)sin mx is an identity in x.

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  13. If 0 lt alpha, beta lt pi and they satisfy cos alpha + cosbeta - cos(a...

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  14. The angles A, B, C of a triangle ABC satisfy 4cosAcosB + sin2A + sin2B...

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  15. Which of the following statement(s) is/are correct?

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  16. If sintheta=K, -1<=K<=1 then number of values of theta for same value ...

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  17. If the sides of a right angled triangle are {cos 2 alpha + cos 2 bet...

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  18. Let a and b be real numbers such that sina + sinb =1/sqrt(2), cosa + c...

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  19. If cosalpha + cosbeta + cosgamma =0= sinalpha + sinbeta + singamma, th...

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  20. If 4costheta-3sectheta=2tantheta, then theta is equal to

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