Question

20. If cosecA = sec(A -10%), where A is an acute angle, find the value of A.​

Answer 1

Answer:

sec 4A = cosec (A - 20°)

s

e

c

4

A

=

c

o

s

e

c

(

A

−

15

∘

)

So,

s

e

c

4

A

=

s

e

c

(

90

−

(

A

−

15

∘

)

)

So,

s

e

c

4

A

=

s

e

c

(

75

∘

−

A

)

4

A

=

75

∘

−

A

5

A

=

75

∘

A

=

75

5

=

13