Mathematics: Which of the following are identities? a) sin^2x - cos^2x = 1 . b) sin^2x = 1 - cos^2x . c) tan^2x = 1 + sec^2x . d) cot^2x = csc^2x - 1

Which of the following are identities? a) sin^2x

Ответ:

angelthompson2018

06.01.2022

B ) sin² x = 1 - cos² x
sin² x + cos² x = 1 ( correct )
D ) cot² x = csc² x - 1
cos²x / sin²x = 1/sin²x - 1 = (1-sin²x) / sin²x = cos²x/sin²x
Identities are B ) and D).

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Ответ:

Meirna

22.06.2021

Mathematics

Well first you have to find the least common denominator
for each, then subtract
7. will be
5/12
4.will be
3/10
10.will be
5/10

when you put the problem in simplest form you will have to rewrite it down

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Which of the following are identities? a) sin^2x - cos^2x = 1 . b) sin^2x = 1 - cos^2x . c) tan^2x = 1 + sec^2x . d) cot^2x = csc^2x - 1

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