Question

if cosec A = 5/4, prove that cos² A = 1 – sin² A​

Answer 1

Step-by-step explanation:

cosec a =5/4 hence sina =4/5

thus cos a=3/5

cos²a =(3/5)²= 9/25

sin²a =(4/5)²=16/25

hence cos²a =1-sin²a