Step-by-step explanation:
tan(2x) = sin(2x)/cos(2x) = 2sinxcosx/(cos^2x - sin^2x).
Dividing the num- and denominator by sinxcosx, we get
2/(cosx/sinx - sinx/cosx) = 2/(cotx - tanx)
cotA + cotB = cosA/sinA + cosB/sinB
We just add them like fractions, with a common denominator of sinAsinB
(cosAsinB + sinAcosB)/sinAsinB
Note that sinAcosB + sinBcosA = sin(A+B)
Therefore we have
sin(A+B)/sinAsinB
Answer:
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Step-by-step explanation:
hop this helps :)
Answer:
A
Step-by-step explanation:
First term = 6 + (1 -1)(-4) = 6 + 0 = 6.
2nd term = 6 + (2 - 1)(-4) = 6 + (-4) = 2.
a3 = 6 + (3 - 1)(-4) = 6 + (-8) = -2.
Its Choice A.