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Page 2 of 4 Verify the identities. 8. cos x - cos3x = cos x sin2x 9. cos x (tan x - sec(-x)) = sin

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Page 2 of 4 Verify the identities. 8. cos x - cos3x = cos x sin2x 9. cos x (tan x - sec(-x)) = sin x - 1 10. cos2 x - tan x = 2 - sin2x - sec2x 11. 1+sin x cos2x - = 1+ 2tan x 12, sec(a)-cos(a) = sin(a) tan (a) 13 . 1 + tan () = CSC'(b) tan (b)

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