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

Ebba is buying bulk fabric and shopping for the best deal. Drag the fabric in order from the least to the greatest unit cost in dollars per square yard.

Please help !! Need to find Vi

The sum of one and one third and five sixth

Divide 30 in the ratio of 2 : 4

Muscles in the stomach aid in the digestive system aid by

compare and contrast the purpose of an epilogue and prologue?

2/9g= -8 how can I solve this?

Who had a successful Revolution in the early nineteenth century

A manufacturer claims that only 1% of their computers are defective, but in a sample of 600 3% were found to be defective. If the 1% claim were true there would

Please help answer statistics question? Statistics professor plans classes so carefully that the lengths of her classes are uniformally distributed between 50.0