Which of the following is an identity?

Step-by-step explanation:

It can be useful to write each of these in terms of sine and cosine. Of course the relationship between sine and cosine is ...

  sin²x + cos²x = 1 . . . . . eliminates choice B

A: (1/sin +cos/sin)² = ((1+cos)/sin)² ≠ 1

C: 1/sin² +(cos/sin)² = (1+cos²)/sin² ≠ 1

D: sin²(1/cos²) +1 = (sin²+cos²)/cos² = 1/cos² . . . (left side)

  (sin/cos)²(1/sin²) = 1/cos² . . . (right side)

left side = right side, so this is an identity

costs the what? what is the cost of the pants?

step-by-step explanation:

if it is $10, then the price is 14.

take 40% of the cost, and then add the cost.

40% of 10 = 4

4+10 = 14.