Question: Use Osborns rule to write down formulae corresponding to (3 - tanx)tan x 1 - 3 tanx (b) cos(x + y) = cos x cos

Use Osborn’s rule to write down formulae corresponding to

(3 - tanx)tan x 1 - 3 tanx (b) cos(x + y) = cos x cos y sin x sin y (c) cosh 2x = 1 + 2 sinhx (d) sin x - sin

(3 - tanx)tan x 1 - 3 tanx (b) cos(x + y) = cos x cos y sin x sin y (c) cosh 2x = 1 + 2 sinhx (d) sin x - sin y = 2 sin(x - y) cos(x + y) (a) tan 3x = =

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