
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
Given the function $y=f(x)$, $x\in D$, which satisfies the following conditions:

1. The function $y=f(x)$ is monotonic in $D$;
2. There exists a real number $m$, $n\in D$, $m < n$, such that when $x\in [m,n]$, the range of the function $y=f(x)$ is $[m,n]$. Then, this function $f(x)$ is called an injective function in $D$. Let $f(x)= \frac {a^{x}+a-3}{\ln a}(a > 0,a\neq 1)$, then:

(1) The monotonicity of the function $y=f(x)$ on $(-\infty,+\infty)$ is ________ (Fill in "increasing", "decreasing", "first increasing then decreasing", "first decreasing then increasing");

(2) When $y=f(x)$ is an injective function in the set of real numbers $R$, the range of $a$ is ________.

Present the answer in LaTex format: \boxed{Your answer}
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