Question

If sin square a= 0 find the cos a

Answer 1

Answer:

cosA= 1, cos A = - 1

Step-by-step explanation:

sin²A =0

sin²A + cos²A = 1

0+ cos²A =1

cos²A = (+-1)²

cosA =1 and cos A= -1

Answer 2

Answer:

cosa=1,-1

Step-by-step explanation:

sin^2a=0

sin^2a+cos^2a=1

sin^2a=1-cos^2a

so,

1-cos^2a=0

cos^2a=1

cos a=1,-1