(a) Use Addition formula to find the exact value of Cos (a + B), , (a in quadrant III) and csc B = ÷, (ß in quadrant II). 3 if tan a= %3D 3 (b) Find the quadrant in which the angle (a + B) lies if csc (a + B)<0. Hint: Use your answer for part (a).

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
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(a) Use Addition formula to find the exact value of Cos (a + B),
5
(a in quadrant III) and cscB =
(B in quadrant II).
if tan a
%3D
3'
(b) Find the quadrant in which the angle (a + B) lies if csc (a + B)<0.
Hint: Use your answer for part (a).
Transcribed Image Text:(a) Use Addition formula to find the exact value of Cos (a + B), 5 (a in quadrant III) and cscB = (B in quadrant II). if tan a %3D 3' (b) Find the quadrant in which the angle (a + B) lies if csc (a + B)<0. Hint: Use your answer for part (a).
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