Function question 3 for powerplay

maybe my glb is wrong , but sure of the lub it's 1. I'll try and tell.

range of

1) sin(cos(tan x)))=[-1,1]

2) cos(sin(tan x)))=[-1,1]

3) tan(cos(sin x)))=[-∞,∞]?

Tanx has a range (-∞,∞)
so the angle for Sin has all values
so Sin wil give values from [-1,1]
Now Cos is an even function and increases from [-1,0),and decreases from [0,1]
so max at 0 and min at 1or -1 that is cos1
draw the graph machan u will get it

which one u want?

for 2 im getting [cos 1, cos 0]

1) [sin-1, sin1]

2) [cos(-1) , cos(1) ]

sky wont the cos(-1)=cos(1)

3)[tan(cos1),tan1]

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