[cos^(-1)(cos((5 pi)/(4)))" is given by "],[[" a "(5 pi)/(4)," b "(3 pi)/(4)," c."(-pi)/(4)," d none of these."]]

Cos^(-1)("cos"(5pi)/4)=

cos^(-1)tan(-(5 pi)/(4))

cos^(-1) tan(-(5pi)/(4))

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

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

cos^(2)""(3pi)/(5)+cos^(2)""(4pi)/(5)=

cos^(-1)((sin x+cos x)/(sqrt(2))),(pi)/(4) lt x lt (5pi)/4

The value of cos((pi)/(7))+cos((2 pi)/(7))+cos((3 pi)/(7))+cos((4 pi)/(7))+cos((5 pi)/(7))+cos((6 pi)/(7))+cos((7 pi)/(7)) is 1(b)-1(c)0(d) none of these

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