Sin 20.sin 10 as sum or difference

see explanation

Step-by-step explanation:

The difference identity for the product is

sinxsiny = [ cos(x - y) - cos(x + y) ], thus

sin20sin10

= [ cos(20 - 10) - cos(20 + 10) ]

= ( cos10 - cos30 )

i'm assuming it's looking for the missing length, which should be 4cm

hope this !

x= -3

step-by-step explanation:

step 1: simplify brackets

4 - x - 1 = 6

step 2: simpilfy

3 - x = 6

step 3: subtract 3 from both sides

-x = 6 - 3

step 4: simpilfy 6 - 3

-x = 3

step 5: multiply both sides by -1

x = -3