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Problems in Mathematical Analysis.pdf - pwp.net.ipl.pt

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424 Answers<br />

s<strong>in</strong> 5* ,<br />

1374. -!-<br />

1377. In<br />

. ^ Jo z4 lo o *<br />

s<strong>in</strong> 7*<br />

1372. ^ cos 6*-^ cos 4* --5- cos 2*. 1373. -f In<br />

tan [ +<br />

*<br />

-<br />

tan -- 1376 '<br />

tan|<br />

. 1378. arc tan (l + tan 4V 1379. ||*--^ In | 2s<strong>in</strong> * +<br />

\ ^ / lo id<br />

+ 3 cos x<br />

tan<br />

Solution. We put 3 s<strong>in</strong> x + 2 cos x === a (2 s<strong>in</strong> x 4- P (2 s<strong>in</strong>* -{-3 cos*)' Whence 2u<br />

+ 3 cos x) +<br />

3^ = 3, 3a + 2p = 12 Q 5 .,,<br />

a= P== We<br />

!3' -!3-<br />

,<br />

have<br />

2 and, consequently,<br />

p3s<strong>in</strong>x + 2crs* , 12<br />

J 2^77+3^7^ ==<br />

13<br />

r<br />

J<br />

Si I * -f- iiC 5>

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