Question

cos square A-Sun square A=2 cos square A-1

Answer 1

hey !!!

1st of all write the question properly before posting ...

question is there cos²A - sin²A = 2cos²A -1

from LHS ..

cos²A - sin²A

=> cos²A - ( 1-cos²A ) ➡[•°•sin²A = 1- cos²A)

=> cos²A - 1 + cos²A

=> 2cos²A - 1 RHS prooved ...


hope it helps !!!

₹Rajukumar111

Answer 2

◀HERE'S ⏬ YOUR ANSWER▶

LHS
${cos}^{2} \beta - {sin}^{2} \beta \\ = {cos}^{2} \beta - (1 - {cos}^{2} \beta ) \\ = {cos}^{2} \beta - 1 + {cos}^{2} \beta \\ = 2 {cos}^{2} \beta - 1$
= RHS (Proved)

⏩HOPE THIS ⬆ HELPS YOU▶