Question

sin a
(1) If A=
then show that
-sina
COS a
cos 2a
sin 2a
cos 3a
sin 3a
-
(i) A
(ii) A
- sin 2a
cos 2a
-sin 3a cos 3a​

Answer 1

Step-by-step explanation:

sinα+cosα=−

l

m

;.....(1)

sinαcosα=

l

n

.....(2)

Squaring (1)

sin

2

αcos

2

α+2sinαcosα=

l

2

m

2

⇒1+

1

2n

=

l

2

m

2

⇒l

2

−m

2

+2/n=0.