Posted by **Shane** on Friday, April 5, 2013 at 10:06am.

Using the exact trigonometric ratios of 45 degree,30 degree and 60 degree,evaluate the following,leaving where necessary your answer in surd form. (a) 3 sin 30 degree-2 cos 60 degree (b)(tan 45 degree)(4 cos 60 degree-2 cos 60 degree)

- Maths -
**Knights**, Friday, April 5, 2013 at 10:12am
sin 30 = 1/2

thus, we get 3/2 - 2cos 60

cos 60 = 1/2

thus we get 3/2 - 2/2 = 1/2

tan45 = 1

so the equation is just 4cos60 - 2cos60

cos 60 = 1/2, as previously mentioned

thus, we get 2 - 1 = 1.....

btw...I think you can just plug these functions into your calculator to figure these out, it is not too hard.

## Answer This Question

## Related Questions

- maths - Using the complementary angle ratio results,find the value of x for the ...
- Maths - 1) Simplification (trigonometric ratios of allied angles)? Simplify : i...
- geometry - Express the following as a function of a single angle sin 20 degree ...
- Algebra II - Identify the degree of each term of polyrnomial and the degree of ...
- trig - simplify tan(-17 degree)+sin(24 degree)+cot(73 degrees)+cos(66 degrees ...
- Math23456 - Problem:4x^2y^3 Choices: a.2nd degree b.3rd degree c.4th degree d....
- Science - 1+ tan*5 degree - csc*85 degree Paste this in the Google search window...
- math - A circle is divided into four segments from the center of the circle. One...
- chemistry - -182 degree c, -68 degree c, 943 degree c, 115 degree c, 0 degree c...
- maths - Cos square 30 degree cos square 45 degree + 4 sec square 60 degree + 1/2...

More Related Questions