Verify the identity: cos x sin x tan x = sec x.

this isn't true. For a counter example, let x = pi/4.
So sin x cos x tan x = 1/2, but sec x = sqrt of 2.

Marie Ridge,

If cos x. sin x. tan x = sec x
cos x.sin x . Sin x/cos x = sec x
sin x. sin x = sec x
sin ~2 x = sec x

Try further, and if it does not help, write here. I am ready to help you, but you must show what you have calculated so far, and from what I suggest, what did you find, now?

The display is not correct, sometimes the plus sign misses unless the "math" environment is used.

The correct assertion is



which is easily solved by multiplying both sides by and using , .