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If cosx+cosy+cosz=sinx+siny+sinz=0" then...

If `cosx+cosy+cosz=sinx+siny+sinz=0" then "cos(x-y)=`

A

0

B

`-(1)/(2)`

C

2

D

1

Text Solution

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The correct Answer is:
B
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VK JAISWAL-COMPOUND ANGLES-Exercise-5 : Subjective Type Problems
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  6. If 10sin^(4)alpha+15cos^(4)alpha=6 and the value of 9"cosec"^(4)alpha...

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  7. The value of (1+tan\ (3pi)/8*tan\ pi/8)+(1+tan\ (5pi)/8*tan\ (3pi)/8)+...

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  8. If alpha=pi/7 then find the value of (1/cosalpha+(2cosalpha)/(cos2alph...

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  9. Given the for a,b,c,d in R, if a sec(200^@)- ctan(200^@)=d and b sec(...

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  10. The expression 2"cos"(pi)/(17)*"cos"(9pi)/(17)+"cos"(7pi)/(17)+"cos"(9...

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  11. If the expression (sin theta sin2theta+sin3theta sin60theta+sin4theta...

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  14. If sum(r=1)^(n)((tan 2^(r-1))/(cos2^(r )))=tanp^(n)-tan q, then find t...

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  15. If x=sec theta-tan theta and y=cosectheta+cot theta,then Find y-x-xy...

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  16. If cos18^(@)-sin18^(@)=sqrt(x)sin27^(@), then x=

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  18. Q. x=a satisfy the equation 3^(sin 2x+2 cos^2 x)+3^(1-sin 2x+2 sin^ 2x...

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  19. The minimum value of (sintheta+c o s e ctheta)^2+(costheta+sectheta)^...

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  20. If tan20^(@)+tan40^(@)+tan80^(@)-tan60^(@)=lambda sin40^(@), then lamb...

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  21. If K^(@) lies between 360^(@) and 540^(@) and K^(@) satisfies the equa...

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