If sinA=√3-1/2√2,then prove that cos2A=√3/2 prove that

Step-by-step explanation:

Here we are given that the value of sinA is √3-1/2√2 , and we need to prove that the value of cos2A is √3/2 .

Given :-

•

To Prove :-

•

Proof :-

We know that ,

Therefore , here substituting the value of sinA , we have ,

Simplify the whole square ,

Add the numbers in numerator ,

Multiply it by 2 ,

Take out 2 common from the numerator ,

Simplify ,

Subtract the numbers ,

Simplify,

Hence Proved !

f(x) = - 2/3x + 5; f(5/2)

substitute 5/2 in for x:

f(5/2) = -2/3(5/2) + 5

simplify the right side:

f(5/2) = -5/3 + 5

f(5/2) = 10/3

answer:

f(5/2) = 10/3

i hope this you!

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step-by-step explanation: