Answer:
Logo, no intervalo [0°,360°] as soluções da equação sen2x=–senx . São: . 0°,120° ... k∈Z . S={x∈IR: X=(π\2)+2kπ , k∈Z } . b) arccos(2x²–1)=2arccos(1/2) .
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i know it
Answer:
Can you send me a picture I am confused
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Answer:the ansewer is 80
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