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I will do 7) (4 + senx) / senx = 10 4 + senx = 10senx 9senx = 4 senx = 4 / 9 x = arcsen(4 / 9) x = 26, 38.

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8

I will do 7)

(4 + senx) / senx = 10

4 + senx = 10senx

9senx = 4

senx = 4 / 9

x = arcsen(4 / 9)

x = 26, 38.