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What is the reason for step 7 in the proof above?

What is the reason for step 7 in the proof above?
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What is the reason for step 7 in the proof above?

User Andrew Johnson
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In step 7:BAE, AE=csinB The answer is definition of sine in right triangle. Because, In a right angles triangle, the sine of an angle is equal to the length of the opposite side divided by hypotenuse.
User Roman Plischke
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