Question: #1. tan 0 =negative sqrt7/2, sec 0>0 #2. (1/sin alpha - 1) - (1/sin alpha + 1) #3. cos 105 degrees #4. 2x, given tan

#1. tan 0 =negative sqrt7/2, sec 0>0

#2. (1/sin alpha - 1) - (1/sin alpha + 1)

#3. cos 105 degrees

#4. 2x, given tan x = 5/3 and sin x< 0

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