Question

if a=1 b=3 c=4 then cosA​

Answer 1

Answer:

cosA=1

Step-by-step explanation:

a=1,b=3,c=4

b^2+c^2-a^2

cosA=-----------------------

2bc

(3)^2+(4)^2-(1)^2

cosA=----------------------------

2(3)(4)

9 +16-1

cosA=----------------------------

24

24

cosA=------------------

24

cosA=1

Answer 2

Answer:

Step-by-step explanation:

a=1,b=3,c=4

b^2+c^2-a^2

cosA=-----------------------

2bc

(3)^2+(4)^2-(1)^2

cosA=----------------------------

2(3)(4)

9 +16-1

cosA=----------------------------

24

24

cosA=------------------

24

cosA=1