Question

sinA+cosA=x then what the value of
cosA- sinA=?​

Answer 1

Answer:

cosa-sina whole square is:

cos2a+sin2a-2sinacosa

cos2a + sin2a + 2sinacosa is whole sq of sina+cosa

hence cosa-sina whole sq is now equal to

(sina+cosa)sq - 4sinacosa

hence

= x2 - 4sinAcosA

I hope this was the correct answer, please upvote. At least I tried ;)