Question

if cos A =3/5 than find the value of sinA-cosA / 2tanA
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Answer 1

Answer:

answer :3/40

I hope you got answer

Answer 2

Step-by-step explanation:

Question: if cos A =3/5 then find the value of sinA - cos A/2tanA?

Solution:-

Given ,cos A=3/5

cos A = adj/hyp

( by using Pythagoras theorem)

AC^2=AB^2+BC^2

5^2=3^2+BC^2

25=9+BC^2

25-9=BC^2

16=BC^2( Transfer square to left side )

_/16=BC

|4=BC|

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WE HAVE TO FIND THE VALUE OF Sin A-cos A/2tanA

Here,

Sin A =opp/hyp=4/5

we know ,cos A= 3/5( given)

tan A=opp/ adj= 4/3

=sinA-cosA/2tanA

=4/5-3/5/2×4/3

1/5/8/3

( the denominator become reciprocal)

1/5×3/8=3/40

hence the value is 3/40