cos 1⁰ + cos 2⁰ + cos 3⁰ +……+cos 179⁰
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1
Answer:
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Step-by-step explanation:
cos 90 = 0
cos 91 = cos ( 180 - 89) = - cos 89
cos92 = cos ( 180 - 88) = - cos 88
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cos 179 = cos ( 180 - 1) = - cos 1
cos 1⁰ + cos 2⁰ + cos 3⁰ +……+cos 179⁰
= cos 1⁰ + cos 2⁰ + cos 3⁰ +……cos 90 + cos 91 + cos 92 .........+cos 179⁰
= cos 1⁰ + cos 2⁰ + cos 3⁰ +……+0 - cos 89 - cos 88 - .........- cos 179⁰
= 0
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Answer:
this is correct...........................
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