trig expressions?

Question

which are identical?

1. a) cos^2 x b) (cosx)^2 c)cos x^2

2. a) (sinx)^-1 b) arcsinx c) sin x^-1 d) 1/(sinx)




thanks in advance for the help!!

could 2 be a, b and d??

Answer 1

Sorry I don't agree with the previous answer on 2.

(sinx) ^ (-1) = 1/(sinx) so a and d

Arcsin(x) should be sin ^-1 (x) It is difficult to tell without knowing the exact position of all the superscript.

Answer 2

Too easy.
1) a and b
2) a and d

Answer 3

1. a) & b) are identical

2. a) & b) are identical