Trig
posted by Rachel
Im having serious issues with verifying Trig. identities. Please help! Here is an example:
(tanXsecX)^2= 1sinX/1+sinX

declan
(sec x  tanx)^2 = (1sinx)/(1+sinx)
use these substitutions
sin²(x) + cos²(x) = 1
cos²(x) = 1  sin²(x)
(sec(x)  tan(x))²
=(1/cos(x)  sin(x)/cos(x))²
= (1sin(x))² / cos²(x)
= (1sin(x))² / (1  sin²(x))
= (1sin(x))² / [(1+sin(x))(1sin(x))]
= (1sin(x)) / (1+sin(x))
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