Question

if sin a =3/5 then the value of sin (90+a)​

Answer 1

Answer:

Given

sinA+cosA=

2

sin(90−A)

⇒

2

1

sinA+

2

1

cosA=sin(90−A)

⇒sinA.cos45

∘

+cosA+sin45

∘

=sin(90−A)

⇒(A+45

∘

)=sin(90

∘

−A)

Equating

A+45=90−A

⇒2A=45

∘

⇒A=22

2

1

∘

A=

8

π

∴cotA=cot

8

π

=

2

+1

it may be wrong also

Answer 2

Step-by-step explanation:

sin (90+a) = sin90cosa + sinacos90 -equation(1)

sin a=3/5

cos a =2/5

put vales in equation (1)

sin(90+a) = 2/5