Let T stand for tan 15Find in the simplest surd form the value of:
a. tan15
b.cos15
Thanks DrongoskiLet T stand for tan 15
tan 30 = tan (15+15) = 2T/(1-T^2) = 1/sqrt(3)
What were your attempts?I do not know what I am doing wrong for the following questions:
a. sin4xcos4x
b. 1+cos(180+2(theta))
c.sinxcosxcos2x
d. 2sin2xcos2x
I used tan (45-30) and ended up getting -1/3 (I am sure this answer isn't right)Let T stand for tan 15
tan 30 = tan (15+15) = 2T/(1-T^2) = 1/sqrt(3)
Choose the positive value.
This cannot be right??
I used tan (45-30) and ended up getting -1/3 (I am sure this answer isn't right)
You were supposed to use the tan rule for this question iirc
(LaTeX seems to be taking a while to load. Basically, using that method you should get (√(3) – 1)/(√(3) + 1). How did you end up with -1/3?)
I used a tan compound angle formula.You were supposed to use the tan rule for this question iirc
The answer is actually 2-Sqaureroot of 3
(LaTeX may take a while to load, it seems to have been that way on this site today. Basically, using that method you should get (√(3) – 1)/(√(3) + 1). How did you end up with -1/3?)
It is the same – rationalise the denominator of my answer to see this (I assume you've learnt how to do this).The answer is actually 2-Sqaureroot of 3
Thanks IntegrandIt is the same – rationalise the denominator of my answer to see this (I assume you've learnt how to do this).
1) Do sin(195°) = sin(135° + 60°), for example, since we know the values of trig. functions at 135° and 60°.1.Use expansion of sin(A+B) to evaluate sin 195
2.Simplify 1/2sin(theta)tan(theta)
Thanks what about the second part?1) Do sin(195°) = sin(135° + 60°), for example, since we know the values of trig. functions at 135° and 60°.
If sin (theta)=3/4, 90 degrees is smaller than (theta) is smaller than 180 degrees, evaluate in surd form,
a. Sin2(theta)
b. cos2(theta)
c.tan2(theta)
In which quadrant does 2(theta) lie in?
Did someone forget these 2?1.Use expansion of sin(A+B) to evaluate sin 195
2.Simplify 1/2sin(theta)tan(theta)