Select and write the correct answer from the alternatives in each of the following :
The principal solution of `cos^(-1)(-1/2)` is :

Select and write the correct answer from the given alternatives in each of the following: sin^4x+cos^4x =

Select and write the correct answer from the given alternatives in each of the following:the value of cos15^@-sin15^@=

Select and write the correct answer from the given alternatives in each of the following: ((2i) / (1 + i))^2 =

Select and write the correct answer from the given alternatives in each of the following : The differential equation of y = c/x + c^(2) is :

Select and write the correct answer from the given alternatives in each of the following:value of cos(5pi)ìs………….

Select and write the correct answer from the given alternatives in each of the following: cos(1125^@) =………..

Select and write the correct answer from the given alternatives in each of the following: 1^c is approximately equal to

Select and write the correct answer from the given alternatives in each of the following: 1^@ is approximately equal to

Select and write the correct answer from the given alternatives in each of the following: The polar form of complex number (1 - i) is

Select and write the correct answer from the given alternatives in each of the following : 2sin((5pi)/12).cos(pi/12) =