Question

Find all solutions of: 5sec9x=-10

Answer 1

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Answer 2

sec 9x = -2
cos 9x = 0.5
9x = arccos 0.5
9x = 60 degrees
x = 6.66 degrees

Answer 3

this is not the only solution within what limits do u require?

Answer 4

sorryy i got that wrong its -0.5 not 0.5

so the least solution is 120 degrres / 9 = 13.33 degrees