Answer:
Step-by-step explanation:
sec (-x)-sin (-x) tan (-x)=cos x
sec(x)-(-sin x)(-tan x)=cos x
1/cos x-sin x(sin x/cos x)=cos x
multiply by cos x
1-sin ²x=cos²x
or 1=sin²x+cos²x
which is true.
Heylo! :D
How are ya? :)
Plan B
Plan A: 15 days per subjet
Plan B: 9 days per subject.
(I am so sorry if this math is actually wrong. It's very late where I am.)