Question

4.If 1 - cos B
prove that 25 sinB (sinB - COSB) = 4.​

Answer 1

Step-by-step explanation:

Cos B = 3/5

by pythagorous SinB = 4/5

then 25 × 4/5 ( 4/5 - 3/5 ) = 4

20 × 1/5 = 4

hence proved