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If A is an acute angle and cotaA+co s ec...

If A is an acute angle and cotaA+co s ecA=3, then the value of (यदि A एक न्यूनकोण है तो और cotaA+co s ecA=3 का मान है )

A

1

B

`4/5`

C

`3/5`

D

0

लिखित उत्तर

Verified by Experts

The correct Answer is:
c

According to the question.
`co s ec+cosA=3`
`(co s ecA-cotA)/(2co s ecA)=(1)/(3) =(10)/(3)`
`co s ecA=(10)/(6)`
`sinA=(6)/(10)=(3)/(5)`
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