Question

If sinx + cosx÷ cos³costs = a tan³x + b tan²x +c tanx + d then a+b+c+d =​

Answer 1

Answer:

Correct option is

C

4

cos

3

x

sinx+cosx

=atan

3

x+btan

2

x+ctanx+d

To find; a+b+c+d, Put, x=

4

π

We get,

=>

2

2

1

2

1

+

2

1

=a+b+c+d

=>

2

×2

2

=a+b+c+d

Hence,

=> a+b+c+d=4