hi i don't know how to solve these problems plz help me to solve it.Simplify the expressions below.
(a) For - infinty< t <infinity ,
cos( tan-1( t )) =
(b) For -1 < w < 1,
cot( cos-1( w )) =
(c) sin( sin-1( x / 7)) =
(d) For what values of x is your answer to part (c) valid?
-1<= x<= 1
-7 <= x <= 7
-pi/2<= x<= pi /2
- pi<= x<=pi
-3.5 pi<= x <= 3.5pi
- infinity< x <infinity
(a) For - infinty< t <infinity ,
cos( tan-1( t )) =
(b) For -1 < w < 1,
cot( cos-1( w )) =
(c) sin( sin-1( x / 7)) =
(d) For what values of x is your answer to part (c) valid?
-1<= x<= 1
-7 <= x <= 7
-pi/2<= x<= pi /2
- pi<= x<=pi
-3.5 pi<= x <= 3.5pi
- infinity< x <infinity
