Answer:
see explanation
Step-by-step explanation:
Using the trigonometric identity
sin²x + cos²x = 1
Consider the left side
2cos²A - 1 ← replace 1 by sin²A + cos²A
= 2cos²A - ( sin²A + cos²A)
= 2cos²A - sin²A - cos²A
= cos²A - sin²A = right side ⇒ verified
Answer:
2x^2+3x+1
Step-by-step explanation:
FOIL
Answer:
3rd
Step-by-step explanation:
I think thats how u fill it
Dab on them haters brobro