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junior college 1 | H2 Maths
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Can't get the answer by letting sin x =x , tan x=x and cos x = 1- x^2/2. Please help. Thank you.
Date Posted: 2 years ago
Views: 447
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x is small, but (π/4+x) is not small !
have to use compound angle formula to expand
sin(pi/4 + x) first ...
similarly, x is small, but 2x may not be small ...
use double angle formula for tan2x.
thereafter, expand & simplify, ignoring any powers of x3 & higher.
have to use compound angle formula to expand
sin(pi/4 + x) first ...
similarly, x is small, but 2x may not be small ...
use double angle formula for tan2x.
thereafter, expand & simplify, ignoring any powers of x3 & higher.
Date Posted:
2 years ago
Thank you
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