Sec square 75 degree + cot square 15 degree

(6 +√3) / (2 - √3).

Step-by-step explanation:

sec 75 = 1/cos 75

cos 75 = cos45cos30 - sin45sin30

= 1/√2 * √3/2 - 1/√2 * 1/2

= (√3 - 1 )/ 2√2.

cos^2 75

=  (√3 - 1 )^2 / (2√2)^2

= (3 - 2√3 + 1 / 8

= (2 - √3) / 4

So sec^2 75  = 4 / (2 - √3)

tan 15 =  tan (45 - tan 30)

= tan 45 - tan 30 / 1 + tan45 tan30

= ( 1 - √3/3 ) / (1 + 1 * √3 / 3)

= (3 - √3) / (3 + √3)

tan^2 15 =  (9 - 6√3 + 3) / (9 + 6√3 + 3)

= 12 - 6√3  (12 + 6√3)

=  2 - √3 / 2 + √3

So cot^2 15 = (2 + √3) / (2 - √3)

Finally sec^2 75 + cot^2 15

= 4 / (2 - √3) +  (2 + √3) / (2 - √3)

= (6 +√3) / (2 - √3)

Step-by-step explanation:

but

You work for the final answer.

i dont know sorry

step-by-step explanation:

step-by-step explanation:

if you want to solve percent error follow these steps.

1. subtract the accepted value from the experimental value.

2. take the absolute value of step 1.

3. divide that answer by the accepted value.

4. multiply that answer by 100 and add the % symbol to express the answer as a percentage.

if you want to solve percent of change just do this.

1. work out the difference (increase) between the two numbers you are comparing.

2. divide the increase by the original number and multiply the answer by 100. if your answer is a negative number then this is a percentage decrease.

hope this : )