Homework Help: Trig

Posted by sally on Saturday, April 17, 2010 at 5:57pm.

4. Asked to simplify the expression sin(180−è), Rory volunteered the following solution:
sin(180−è) = sin 180−sin è, and, because sin 180 is zero, it follows that sin(180−è) is the same as −sin è. Is this answer correct? If not, what is a correct way to express sin(180−è)
in simpler form? Answer the same question for cos(180 − è).

Trig - bobpursley, Saturday, April 17, 2010 at 6:01pm
Isn't

Sin(A+B)=SinA Cos B + CosA sinB

sin(180-e)= Sin180 Cos -e + Cos180 sin -e
= 0 -sin -e=sine

Answer this Question

Related Questions

Trig - A. Find simpler, equivalent expressions for the following. Justify your ...
trig - I am very confused about the concepts of.. sin è = sin(180 - &...
Trignometry - Let m and M be the minimum and maximum values of the domain of f(x...
Math - θ is an angle such that 180∘<θ<...
trigonometry - is this correct? sin 255degrees 225 = 180 + 45 sin(225) = sin(180...
Math - If y = sin−1 x, then sin y = x,−π/2 &#...
Trigonometry - If A + B + C = 180°, Prove that Sin² (A/2) + sin² (...
maths - Choose the option that gives an expression for the indefinite integral &...
Trigonometry - If A + B + C = 180°, Prove that Sin² (A/2) + sin² (...
Pre Calculus - Use one of the identities cos(t + 2ðk) = cos t or sin(t + 2&...

For Further Reading

First Name:
School Subject:
Answer: