Question

cos 81'– sin 9' = 0​

Answer 1

Answer:

hey DUDE!

YOUR ANSWER IS...

Step-by-step explanation:

cos 81'– sin 9' = 0

0.36467=0

values are not equal.

given equation is FALSE.

HOPE IT'S HELPS...

Answer 2

Step-by-step explanation:

cos 81' - sin 9'

cos ( 90' - 9') - sin 9'

= sin 9' - sin 9'. { cos ( 90' - 9') = sin 9' }

= 0