Reviewing for RLS AATP Final

We did problems with trigonometry reviewing for the final.

The six trig functions are the ones in the two acronyms
SOHCAHTOA
CHOSHACAO

Sine, cosine, tangent, cosecant, secant, cotangent

One problem had numbers that looked like a 30 60 90 triangle.

A few times, the substitution of 1 = sin^2x + cos^2x

The trig functions can all be written in terms of sine and cosine and really, you could even write everything in terms of sine (but that wouldn’t be useful in this context).

It would help sometimes to be more comfortable with radians.

Why you should not use the Law of Sines if you can use SOHCAHTOA instead

We went over some of the harder problems from previous tests. Some dealt with the Law of Sines and the Law of Cosines.

Others could simply use SOHCAHTOA. If you have a right triangle and one angle and a side (you could get the other angle beside the right angle easily) then you can use SOHCAHTOA.

That will be simpler and less steps and will reduce to the same thing as using SOHCAHTOA.

How to use logarithms to solve a problem with a variable exponent

Reviewing for RLS Final, Trig Functions

We reviewed for the final by mostly going over problems with trig functions.

SOHCAHTOA
CHOSHACAO

Understanding the reciprocal relationships was useful for a few problems.

Sometimes the double angle and half angle formulas were used.

Rewriting the functions in terms of sinx and cosx can be useful. As is knowing that sin^2x + cos^2x = 1 .

It would be helpful to memorize that
sin(0°) = 0
sin(90°) = 1
cos(0°) = 1
cos(90°) = 0

Logarithm Properties, Tutoring at RLS

We worked on a problem with exponents and algebra.

Logarithms can be very useful for these problems.

There are three basic properties which are often used, two of them were used in this problem.

The logarithm of a quotient is the logarithm of the numerator minus the logarithm of the denominator.

The logarithm of a product is the logarithm of the first term plus the logarithm of the second term.

And the logarithm of something with an exponent brings the exponent in front of the expression as a multiplication.

Tutoring Law of Cosines, RLS Friday Sheet

We mostly worked on problems with the Law of Cosines. Along with the Law of Sines, this equation can be helpful in figuring out sides and angles of triangles. The Law of Cosines is the Pythagorean Theorem generalized for triangles that are not right triangles.

Also looked at a Friday sheet. One problem with exponents and logarithms was the most involved.

Another involved asymptotes.

Algebra at CSUMB with trig identities- sine, cosine, tangent, cosecant, secant, cotangent

We mostly did problems with trig identities.

SOHCAHTOA
CHOSHACAO

Reduced a few radicals to a simpler form.

Talked about how the 30 60 90 triangle and 45 45 90 triangles have ratios that you should probably know in this context.

Algebra at CSUMB with logarithms

We mostly looked at problems with logarithms.

Used both the properties for the log of a product and the log of a quotient.

Saw how the base, exponent, and result are placed in the equations.

Graphed a few related functions. You can graph functions using an x and y grid and using points. It helps to know the shape in advance, but that’s not completely necessary.

Tutoring math at CSUMB, systems of equations and quadratic equations

We started by looking at systems of two equations with two variables and using substitution to solve.

Then did a few problems with three equations and three variables.

Also used u-substitution to solve a few quadratic equations. If they can be factored, that can be easier. Sometimes quadratic equations cannot be easily factored, in which case it can be useful to use the Quadratic Formula.

Tutoring Algebra at CSUMB, vertical line test and horizontal line test

We looked at functions and inverses of function.

One quick way to see whether something is a function is to do the vertical line test. If a vertical line can ever pass through two points, it’s not a function.

An inverse function switches the x and y values. You can figure out if a function has an inverse that is a function by doing the horizontal line test.

Looked at telling the shape from a few types of equations, especially lines and parabolas.