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[" 15.If "sin theta=(-4)/(5)" and "theta...

[" 15.If "sin theta=(-4)/(5)" and "theta" lies in the third quadrant,then "cos(theta)/(2)=],[[" (a) "(1)/(sqrt(5))," (b) "-(1)/(sqrt(5))],[" (c) "sqrt((2)/(5))," (d) "-sqrt((2)/(5))],[" 16.If "sin(alpha-beta)=(1)/(2)" and "cos(alpha+beta)=(1)/(2)," where "alpha," and "beta],[[" (a) "alpha=45^(@),beta=15^(@)," (b) "alpha=15^(@),beta=45^(@)],[" (c) "alpha=60^(@),beta=15^(@)," (d) None of these "]]]

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