Trigonometric equations with multiple angles

Trigonometric equations with multiple angles

Postby ariannadimartino » Thu Oct 31, 2019 10:20 am

Hi guys
what is the logic behind the expressions i highlighted?
I just don’t understand
thank you
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FD17CFBD-286B-4A58-A4EC-84157965ED82.jpeg (52.9 KiB) Viewed 79 times
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