4. Find the value of cos (A+B) for A terminating in quadrant III and B terminating in quadrant IV where sin A= -1/3 and cos B= 2/5. GLE OF ELEVATION AND ANGLE OF DEPRESSION.
4. Find the value of cos (A+B) for A terminating in quadrant III and B terminating in quadrant IV where sin A= -1/3 and cos B= 2/5. GLE OF ELEVATION AND ANGLE OF DEPRESSION.
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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Help me number 4pls.
Transcribed Image Text:Other Trigonometric Functions
Sin (A + B) = Sin A cos B + Sin B cos A
Sin (A- B) = Sin A Cos B - sinB cos A
ios (A + B) = cos A Cos B - sin A Sin B
Cas (A-B) = cos A Cos B + sin A sin B
Sin 20 = 2 sin & Cas &
Cos 24 = Ces* - Sin+
Tan A + Tan B
Tun (A+ B) =
|- Tan A Tan B
2 Tant
Tan 2+ =
|- Tan' 4
Transcribed Image Text:IV. Find tan (A+B).
3. If cos e = -5/13 and 0 terminates in the second quadrant, determine sin 20.
4. Find the value of cos (A+B) for A terminating in quadrant III and B terminating in quadrant IV
where sin A= -1/3 and cos B= 2/5.
ANGLE OF ELEVATION AND ANGLE OF DEPRESSION.
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