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d1i1m1o1n [39]
3 years ago
10

Which of the following is a trigonometric identity?

Mathematics
2 answers:
marin [14]3 years ago
8 0

Answer:

third one

I'm assuming does 2's are squared symbols.

Step-by-step explanation:

It's the third one because

sin^2 x sec^2 x

sin^2 x (1/cos^2 x) by reciprocal identity

sin^2 x/cos^2 x by multiplicative identity prop

tan^2 x by quotient identity

The first one wouldn't work because plugging in pi/4 gives 1+1=1 which isn't true.

The second one doesn't work because plugging in pi/4 gives 2+2=1 which isn't true.

The last equation doesn't make sense at all. There is no variable on the left and on the right there is an extra variable.

Ad libitum [116K]3 years ago
7 0

Answer:

it's the first one... I think

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