sin²6⁰+sin²42⁰+sin²66⁰+sin²72⁰
I have checked the question, it is correct. please help me on how to solve cos114⁰
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Answer:
Sin242° – Sin212°
= Sin(42° + 12°) . Sin(42° – 12°)
= Sin54°. Sin30°
= (√5 + 1)/4.1/2
=(√5 + 1)/8
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