Dayv O.
cos^2(x)=1-sin^2(x) is a fine way to conclude equation holds for all x.
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01/14/23
Verify the Trigonometric identity
[sin2(x)-1]/[tan(x)sin(x)-tan(x)]=[sin(x)+1]/[tan(x)]
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2 Answers By Expert Tutors
Mark M. answered • 01/14/23
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Mathematics Teacher - NCLB Highly Qualified
(sin2 x - 1) / (tan x sin x - tan x)
(sin x + 1)(sin x - 1) / tan x (sin x - 1), sin x ≠ 1!
sin x + 1 / tan x
Q.E.D.
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Mark M.
Transforming only one side of an identity to prove it is the accepted method.01/14/23