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[" 163.If "cos(theta-alpha)=a,sin(theta-...

[" 163.If "cos(theta-alpha)=a,sin(theta-beta)=b" ,then "],[cos^(2)(alpha-beta)+2ab sin(alpha-beta)" is equal to "],[[" (a) "4a^(2)b^(2)," (b) "a^(2)-b^(2)," (c) "a^(2)+b^(2)," (d) "-a^(2)b^(2)]]

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