Question

Please answer question ASAP! Use the triangle below to determine which of the following statements are true. (The answer choices are in the images and the other answer choice is in the comments) p.s. There are three correct answer choices. Thank you

Answer 1

Choice A is true. This is the Pythagorean identity. One of the most fundamental trig identities you should memorize.

Choice B is false. Let A = 60 and B = 30 and you'll see the left hand side turn into 0.5 while the right hand side turn into -0.5

Choice C is true. This is a variation of the identity tan^2+1 = sec^2 (just subtract tan^2 from both sides)

Choice D is true as this is a more complicated variation of 1+tan^2 = sec^2