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Adalynn Preston
Mathematics
20 December, 18:25
How do I simplify (tanx/1+secx) + (1+secx/tanx)
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Teagan Horne
20 December, 18:48
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Tan x / (1 + sec x) + (1+sec x) / tan x
Tan x=sin x / cos x
1 + sec x=1 + 1/cos x = (cos x+1) / cos x
Therefore:
tan x / (1 + sec x) = (sin x/cos x) / (cos x+1) / cos x=
= (sin x * cos x) / [cos x * (cos x+1) ]=sin x / (Cos x+1)
(1+sec x) / tan x=[ (cos x+1) / cos x] / (sin x/cos x) =
=[cos x (cos x+1) ] / (sin x * cos x) = (cos x+1) / sin x
tan x / (1 + sec x) + (1+sec x) / tan x=
=sin x / (Cos x+1) + (cos x+1) / sin x=
= (sin²x+cos²x+2 cos x+1) / [sin x (cos x+1) ]=
Remember: sin²x+cos²x=1⇒ sin²x=1-cos²x
= (1-cos²x+cos²x+2 cos x+1) / [sin x (cos x+1) ]=
=2 cos x+2 / [sin x (cos x+1) ]=
=2 (cos x+1) / [sin x (cos x+1) ]=
=2 / sin x
Answer : tan x / (1 + sec x) + (1+sec x) / tan x = 2/sin x
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