Answer:
Option b.
Step-by-step explanation:
we have
Evaluate
therefore
He did not apply the power to the denominator of 3/5
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=(5x+4)°
=(2x-2)°
=(4x-6)°
we know that,
=
+
According to the question,
so,
=(4x-6)°=(4×12-6)°=(48-6)°=42°