What is the area of the white boarder? 2cm 8cm 9cm 15cm
2 answers:
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Hi there!
To solve, we must use the following trig identity:
sin(u - v) = sin(u)cos(v) - sin(v)cos(u)
We can rewrite the left hand side of the equation as:
Split the fraction:
First fraction reduces to 1:
Simpify each with common arguments:
No; we have . Substituting these into the DE gives
which reduces to , true only for
.