Question

Please my help it's important..
No spam ___________
Question no.12

Answer 1

Here is your answer~

✍️✍️ please mark it brainlist answer.....

Answer 2

Answer:

Step-by-step explanation:

⇒ ( cos u  cos v  −  sin u  sinv ) ( cos v ) + ( sin u  cos v  +  cos u  sin v ) ( sin v )

 ⇒ cos u  cos 2 v  −  sin u  sin v cos v + sin  cos v+ sin u cos v sinv + cos u sin 2 v

⇒

cos

u

cos

2

v

+

cos

u

sin

2

v

⇒

cos

u

(

cos

2

v

+

sin

2

v

)

Applying the pythagorean identity  

sin

2

x

+

cos

2

x

=

1

:

⇒

cos

u

Hopefully this helps!