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Sophie [7]
3 years ago
15

Which of the following are trigonometric identities ? Check all that apply. Tan^2 x -

Mathematics
1 answer:
snow_tiger [21]3 years ago
3 0
I hope you are looking for these answer choices as you have not posted the choices. Therefore, I have a similar question with these answer choices.

a). tan² x - 1 = sec²x
b). 4 cosxsinx = 2cos + 1 -2sinx
c). tanx cosx cscx = 1
d). 1- tanx tany = cos(x+y) ÷ cosx cosy

<span>Options B, C, D are correct because, for all them, left-hand side equals to the right-hand side for x = 0.

The option A)
</span>tan² x - 1 = sec²x<span> is not true. 
since x = 0
Therefore,
The Right hand side would be:
                                         </span>tan² x - 1 = sec²(0)<span>
                                                             = 1
The Left hand side would be:
                                         </span>           tan² x - 1 = tan² (0) - 1
                                                                   = 0 - 1
                                                                   = -2
Therefore,
Both sides are not equal so it's not a trigonometric identity.
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