Review the steps of the proof of the identity sin (A-3pi/2 )= cos A.
sin(A-3pi/2)
Step 1: = sinAcos (3pi/2)-cosAsin(3pi/2)
Step 2: = (sinA)(0) + COSA(-1)
Step 3: = (sinA)(0) + (1) (COSA)
Step 4: = 0 + COSA
Step 5: Cos A

At what step was an error made?

pls help!!

what statement? is there an image?

hello,

b) 62.47% of the students are between 14 and 18 years old.

step-by-step explanation:

mean = 15 and standard deviation = 2

student between 14 to 18

formula used z-score

for age 14 , z score

using z-table , p(z> -0.5)=0.3085

for age 18 , z score

using z-table , p(z< 1.5)=0.9332

p(-0.5< z< 1.5)=0.9332-0.3085 = 0.6247

thus, 62.47% of the students are between 14 and 18 years old.

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step-by-step explanation:

nope.   happens to me as well.

-aparri