prove sin(x - pi/2) = -cosx

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prove sin(x - pi/2) = -cosx
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Thank you !! short video but a lot of info

yeonhwabang
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0:09-0:11 I felt that. Thank you so much for this video! Such a huge help!

Da_meg
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☺️💕Thank you very much for the information

cilinenina
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i no understand i in the 4th grade but I am already learning trigonometry. Can you please explannn more in depth. <3 love from china

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