Establish the identity:
(1-sina/1+sin a)-(1+sin a/1-sin a)=-4 tan a sec a

How many sides does a regular polygon have if each exterior angle measures 72a.3b.4c.5d.6

In the diagram below, dab and dac are adjacent angles. if mdac = 25°, what is mdab in degrees? what is mbac in degrees?

Agroup of students want to create a garden. they do not know the exact measurements but they propose using a variable to represent the length and width of the garden. the length of the garden is 10 feet longer than double the width. use a single variable to write algebraic expressions for both the length and width of the garden. write an algebraic expression for the area of the garden. use mathematical terms to describe this expression.