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

Step-by-step explanation:

1. Keeping on mind that , you have:

2. Simplify it, then you obtain:

3. Keeping on mind that , you obtain:

Step-by-step explanation:

We want to verify that;

We take only the expression on the left hand side and work to get the expression on the right hand side.

We cancel the common factors to get;

We now use the Pythagorean identity;

We make the subject to obtain;

as required.

The basic trigonometric identity we used is

15

step-by-step explanation:

we are given the following expression and we are to solve it and find the product:

-13 × (-5)

solving the given expression in the standard order of solving a mathematical expression, beginning with the opening of brackets and then multiplying the terms and changing their signs.

-3 × -5 = 15 (answer is positive because when negative is multiplied with negative, it gives a positive answer)