Could you repost answer explanation to CollegeBoard Test 3, Math 4.23? Specifically, is there a way to solve this if you don’t know the little trig ID about complementary angles?

In the equation below, the angle measures are in radians and is a constant.

𝑠𝑖𝑛(𝜋/8)=𝑐𝑜𝑠(𝜋/𝑎)

Which of the following could be the value of ?

Start by drawing it! Note that OC = 5 and OD = 5 because both of those are also radii. Note also that because chord CD is perpendicular to OB, it’s bisected by OB. In other words, it’s split into 2 segments each measuring 4. Things are really coming together! Because we know our Pythagorean (more…)

Trigonometry does the trick here. Below is that line making a 42° angle with the positive x-axis. I’ve also drawn a dotted segment to make myself a neat little right triangle. Remember that slope is rise over run—how high the line climbs divided by how far it travels right. In this case, the dotted segment (more…)

Think of a 5-12-13 triangle (that’s one of the Pythagorean triples you should know). Say angle A measures x°, which would make angle C measure (90 – x)°. (I’m choosing those based on the fact that I already know that the sine of angle C will be 12/13.) Now that we’ve got it set up, all we (more…)

Hi, I was wondering if you could explain to me how x + y= π/2, sin x = cos y. Thank you!

Test 4 Section 3 Number 17

Test 7 Section 4 #36

Test 5, Section 4, Question 20. How do you get to the answer?

Test 3 Section 3 #20

Test 1 Section 3 number 19. Thanks!

It is given that sin A = K , where A is an angle measured in radians and (pi)< A < 3(pi)/2 . If sin B = K which of the following could be the value of B ?

A) A – (pi)

B) (pi) + A

C) 2(pi) – A

D) 3(pi) – A

Which of the following gives the length of chord DF in the figure above ?

A) 2cos(1.7)

B) 2sin(1.7)

C) 4cos(0.85)

D) 4sin(0.85)

If cosA is not equal to 1, then sin^2A/ 1-cosA =

A) 1 + cosA

B) cosA

C) 1-cosA

D) 1

E) cosA -1

Math1 question:

In right triangle ABC in the figure above, if sin A = 0.6, what is sin B?

A) 0.36

B) 0.40

C) 0.60

D) 0.64

E) 0.80