Respuestas
Respuesta:
Explicación paso a paso:
3.cost tan t = cos t .sen t/ cost = sen t
4. cos t csc t = cos t .1 /sen t = cos t /sen t = cot t
5. sen θ sec θ = sen θ. 1/cos θ =sen θ/cos θ= tan θ
6. tan θ csc θ = (senθ/cos θ) (1/senθ)= 1/cos θ = cot θ
7.tan²x - sec² x = sen²x/ cos²x - 1/cos²x = sen²x-1/cos²x= -cos²x/cos²x=-1
8.sec x /csc x = 1/cos x / 1/ sen x = sen x/cos x = tan x
9. sen u +cot u cos u = sen u + cos² u /sen u = sen²u+cos²u /sen u
= 1/sen u = csc u
10. cos² θ(1+ tan² θ)= cos² θ + cos² θ.sen² θ/cos² θ=cos² θ+sen² θ= 1
11. sec θ-cos θ /sen θ = 1/ cos θ - cos θ / sen θ = 1-cos² θ/ cos θ /sen θ
= sen² θ / cos θ sen θ = sen θ/cos θ= tan θ
12. cot θ /csc θ-sen θ = cos θ/ sen θ / 1-sen²/sen θ =
cosθ sen θ/ sen θ.cos²θ = 1/cos θ= sec θ
13.sen x sec x/tan x = sex .1/cos x / tan x= tan x/tan x =1
14. cos³x +sen²x. cos x= cos³x + (1-cos²x)cos x=cos³x+cos x-cos³x=cos x
........