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EXPLANATION
We want to evaluate:
We can use scientific calculator to evaluate this directly to obtain:
Or
You could have also let:
Then,
The angle whose tangents is 1 is
Or
ANSWER
Or
EXPLANATION
We want to evaluate:
We can use scientific calculator to evaluate this directly to obtain:
Or
You could have also let:
Then,
The angle whose tangents is 1 is
Or