Fill in the blanks:

1. If `tan x = -2.5 ` then ` tan (-x)` =  

2. If ` \sin x = 0.4 ` then ` \sin (-x)` =  

3. If ` \cos x = 0.7` then ` \cos (-x) `=  

4. If ` tan x = -4` then ` tan (\pi+x) `=  

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