Which of the following statements is true? a. sin 30° = cos 30° b. sin 35° = cos 55° c. sin 60° = cos 60° d. sin 55° = cos 25°

Only statement (b) is correct.

Step-by-step explanation:

Given certain trigonometric equality , we have to check which statements are true.

We know ,

We will check each statement one by one,

Consider,

a)

We know from trigonometric table that ,

and  

Thus,

b)

Using above identity

Thus,

c)

We know from trigonometric table that ,

and  

Thus,

d)

Using above identity

Thus,

Thus, only statement (b) is correct.

answer: it would most likely be y=6 and 5/7.

step-by-step explanation:

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