bonjour
sin²x + cos²x = 1 (1) et tan x = sin x/cos x (2)
1 + 1 / tan²x = 1 + cos²x/sin²x (on utilise (2) )
= sin²x/sin²x + cos²x/sin²x
= (sin²x + cos²x) / sin²x
= 1 / sin²x (on utilise (1) )
= 1 /(1 - cos²x) ( on utilise (1) )
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bonjour
sin²x + cos²x = 1 (1) et tan x = sin x/cos x (2)
1 + 1 / tan²x = 1 + cos²x/sin²x (on utilise (2) )
= sin²x/sin²x + cos²x/sin²x
= (sin²x + cos²x) / sin²x
= 1 / sin²x (on utilise (1) )
= 1 /(1 - cos²x) ( on utilise (1) )