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This is one possible approach

Date Posted:
1 week ago

how does the denominator become sinA/cosA - sinB/cosB

Similar to

(xy - zy) ÷ (ay)

= (xy ÷ ay) - (zy ÷ ay)

= x/a - z/a

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Follow the purple writing - how the denominator is simplified

Date Posted:
1 week ago