Question: Could use some help with these 4 questions. Please and thank you! W caps lock Mar # 17-20 Choose 3 out of 4 17. Use

Could use some help with these 4 questions. Please and thank you!

W caps lock Mar # 17-20 Choose 3 out of 4 17. Use a double-angle formula to find the exact value of sin20 when cose = - 5 where at
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