Question

If sin b is equal to 1 upon 2 show that 3 cosec theta b - 4 cosec theta equal to be equal to zero

Answer 1

Answer:

sinB=

2

1

cosB=

1−sin

2

B

=

1−

4

1

=

2

3

∴ B=cos

−1

(

2

3

)=30

o

∴ 3cosB−4cos

3

B=cos3B=cos(3×30

o

)

=cos90

o

=

0