One third times twentytwo minus four equals to

What basic trigonometric identity would you use to verify that sin x cos x tan x =1-cos^(2)x?

Which statement is true 1.the pythagorean theorem can be used to find the missing side of any triangle 2.the pythagorean theorem can be used to find the missing side of any polygon 3. the pythagorean theorem can be used to find the missing side of any right triangle 4.the pythagorean theorem can be used to find the missing side of any isosceles triangle

When i'm with my factor 5, my prodect is 20 .when i'm with my addend 6' my sum is 10.what number am i