ccj2609 ccj2609

01-09-2019
Mathematics

contestada

cos²x - 2 sin²x = -2 .Help me to solve it

Respuesta :

kosala1478 kosala1478

01-09-2019

Step-by-step explanation:

note that

sin²x = (1-cos²x)

LHS= cos²x - 2 sin²x

= cos²x - 2(1-cos²x)

= cos²x - 2 + 2cos²x

= 3cos²x - 2

or

cos²x = (1-sin²x)

LHS= cos²x - 2 sin²x

=1-sin²x - 2 sin²x

= 1-3sin²x

Answer Link

Otras preguntas

What happened to the “bad guys?” What did they have to do?

If a quadrilateral has exactly one pair of congruent, opposite angles, then the quadrilateral is a ______

entouez la mot approprié pour completer les phrases:

Which of the following is the parent function of all absolute value functions? f(x) = 3x f(x) = |x| f(x) = 2|x| f(x)= x^2

help plsss- it’s not letting me post omh :/

Please help!! How do I write the inversion of these questions in french 1. Est-ce qu’il fair ses devoirs? 2. Avec qui est-ce que tu étudies?

what is the theme of a story ?

HELP I NEED HELP ASAP HELP I NEED HELP ASAP HELP I NEED HELP ASAP HELP I NEED HELP ASAP HELP I NEED HELP ASAP HELP I NEED HELP ASAP HELP I NEED HELP ASAP HELP I

WHAT happened when the us attacked iraq

Please help me with this. I will appreciate all the help ^^