Find the vector v having length |v| = 4, and direction ? = 225°.
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Multiply.(x + y - 4)(x + y + 4)
A. x2 + 8xy + y2 - 16 B. x2 + y2 - 16 C. x2 + 2xy + y2 + 8x + 8y - 16 D. x2 + 2xy + y2 - 16
Factor the GCF out of the given expression.4t2 - 8t - 8
A. 4t(t2 - 2t - 2) B. 4(t2 - 8t - 8) C. 4(t2 - 2t - 2) D. 4(t2 - 4t - 4)
Provide an appropriate response.Determine which technique would be the best initial step to verify each of the four identities below. Each of the identities involves a different technique as the initial step. 
= 
1 - 
= cos2 ? 
= 2 cot ? - 5 csc2 ? + tan2 ? - cot2 ? = sec2 ?Which of the following is not one of the four techniques required? I. Rewrite the
expression in terms of sines and cosines. II. Multiply the numerator and denominator of a quotient by the conjugate of the denominator. III. Use a Pythagorean identity. IV. Separate a quotient into one or more quotients. V. Use factoring techniques. A. technique III B. technique II C. technique V D. technique IV
Use the given information to find the exact value of the expression.tan ? = 
, ? lies in quadrant III, and cos ? = - 
, ? lies in quadrant II
Find sin (? + ?).
A. - 
B. 
C. 
D. 