Question

-1 cos B= 2/5, prove that 25 sin B( sin B-cos B)= 4​

Answer 1

Answer:

it's too hard (╥﹏╥)

Step-by-step explanation:

what should I do I m bad at it too

Answer 2

Step-by-step explanation:

AC2=AB2+BC2=242+72=625

AC=25cm

(i) sinA=ACBC=257;cosA=ACAB−2524

(ii) sinC=ACAB=2524;cosC=ACBC−257