Q-10 If sin A:cos A = 12:13, find tan A, sin A and cos A
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Step-by-step explanation:
cosA=
13
12
---- ( 1 )
We know,
sin
2
A+cos
2
A=1
⇒ sin
2
A+(
13
12
)
2
=1 [ From ( 1 ) ]
⇒ sin
2
A+
169
144
=1
⇒ sin
2
A=1−
169
144
⇒ sin
2
A=
169
169−144
⇒ sin
2
A=
169
25
⇒ sinA=
13
5
----- ( 2 )
Now,
tanA=
cosA
sinA
⇒ tanA=
13
12
13
5
[ From ( 1 ) and ( 2 ) ]
⇒ tanA=
12
5
∴ sinA=
13
5
=0.385
∴ tanA=
12
5
=0.417
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