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[" 3."cos^(-1)((1)/(sqrt(2))(cos(7 pi)/(...

[" 3."cos^(-1)((1)/(sqrt(2))(cos(7 pi)/(5))sin(2 pi)/(5)))" is equal to "],[[" (A) "(23 pi)/(20)," (B) "(13 pi)/(20)," (C) "(3 pi)/(20)," (D) "]]

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cos^(-1){(1)/(sqrt(2))(cos(7 pi)/(5)+sin(2 pi)/(5))} is equal to (A) (23 pi)/(20) (B) (13 pi)/(20) (C) (3 pi)/(20) (D) (7 pi)/(20)

cos^(-1)((cos(7 pi))/(5)) is equal to

cos^(-1)((cos(7 pi))/(6)) is equal to ( a ) (7 pi)/(6) (B) (5 pi)/(6) (C) (pi)/(3)(D)(pi)/(6)

cos ^(-1) [ cos ((7pi)/(5))] is equal to

cos^(-1)(cos((5 pi)/(3)))+sin^(-1)(sin((5 pi)/(3)))=

sin^(-1)(cos((5pi)/4)) is equal to

sin^(-1)(cos((5pi)/4)) is equal to

cos^(-1) (1/sqrt2 (cos ((7pi)/5)-sin((2pi)/5))) is equal to (a pi)/b where a,b in N and a is prime then (b-2a)=

cos ^(-1)"" (1)/(sqrt(5))+ cos ^(-1) ""(2)/(sqrt(5))=(pi)/(2)

cos^(-1)(cos(5 pi/(3))+sin^(-1)(cos(5 pi/(3))=