Establish the identity.sin
= 
(cos x + sin x)
What will be an ideal response?
sin 
= sin 
cos x + sin x cos 
= 
(cos x + sin x).
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Express the sum using summation notation. Use a lower limit of summation, not necessarily 1, and k for the index of summation.(a + 1) + (a + b) + (a + b2) + . . . + (a + bn)
A. 
B. 
C. 
D. 
Find all values of x in the interval [0°, 360°) that satisfy the equation. Round approximate answers to the nearest tenth of a degree.sin2 x - 8 sin x - 4 = 0
A. {28.2°, 151.8°} B. No solution C. {208.2°, 331.8°} D. {28.2°, 151.8°, 208.2°, 331.8°}
Express the given trigonometric function in terms of the indicated function.tan ? in terms of cos ?
A. 
B. 
C. 
D. 
Find 
. Express the answer in standard form.z1 = 5(cos 200° + i sin 200°)z2 = 4(cos 50° + i sin 50°)
A. -10 + 10i
B. - 
+ 
i
C. -2 + 2i
D. - 
+ 
i