Question

CosA=4/5 then show that sinA.tanA=9/20

Answer 1

Answer:

Step-by-step explanation:

Answer 2

Step-by-step explanation:

CosA= 4/5= base/hypo.

The given right angle triangle is the triplet of 3,4,5

where base=4, Hypo.=5

So,

perpendicular=3

Now,

SinA=Perp./Hypo.=3/5

TanA=Perp./Base=3/4

So, SinA.TanA=(3/5).(3/4)

SinA.TanA=9/20

Hence proved

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