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jasminelara740
02.08.2019 •
Mathematics
What is the x-intercept of y =8x+12?
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Ответ:
The x-intercept is (-3/2,0)
Ответ:
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
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)
tan² x - 1 = sec²x is not true.
since x = 0
Therefore,
The Right hand side would be:
tan² x - 1 = sec²(0)
= 1
The Left hand side would be:
tan² x - 1 = tan² (0) - 1
= 0 - 1
= -2
Therefore,
Both sides are not equal so it's not a trigonometric identity.