Question

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Solve the equation cos x degrees = sin 40 degrees , where 0 < x < 90.

A. x = 40

B. x = 90

C. x = 50

A. x = 20

Answer 1

We know that X is in the 1st quadrant right?

Answer 2

derive the equation and solve for x

Answer 3

when you transpose cos ,

it will become cos^-1 or inverse cosine.
plug it in your calculator :)

Answer 4

btw knowing that the 1st quadrant has a maximum of 90* we should have a reasonable answer

Answer 5

Sooo... B. ?

Answer 6

what formula did you get for x ?

Answer 7

I didnt get anything.. I was just guessing.

Answer 8

dont guess ,that wont help you with anything,

lets start step by step :)

Answer 9

Okayy..

Answer 10

Alrightt!

Answer 11

any ideas?

Answer 12

Uhhh.. A?

Answer 13

dont guess

Answer 14

Hint: Transpose cos, what will you get then>?

Answer 15

The answer is C!

Answer 16

How did you get that?

Answer 17

I guessed xD It said it was correct soo..