Question

If tano
,
12
5
find the value of cose.

Answer 1

Answer:

Correct option is

B

5

17

cotA=

5

12

=

P

B

B=12 and P=5

H

2

=B

2

+P

2

⇒H=

B

2

+p

2

⇒H=

12

2

+5

2

⇒H=

144+25

⇒H=

169

=13

Then sinA=

H

P

=

13

5

cosA=

H

B

=

13

12

cosecA=

P

H

=

5

13

∴(sinA+cosA)×cosecA=(

13

5

+

13

12

)×

5

13

⇒

13

17

×

5

13

=

5

17