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Greeley [361]
3 years ago
9

(Cosx)/(1+sinx) - (1+sinx)/(cos) solve

Mathematics
2 answers:
Rina8888 [55]3 years ago
8 0
2/cos x 

........................


vazorg [7]3 years ago
6 0
Cos^2x  - (1+sinx)^2 / cosx(1+sinx)

= cos^2x - (1 + sin^2x + 2sinx) / cosx(1+sinx)

= cos^2x -1 - sin^2x - 2 sinx / cosx(1+sinx)

= - sin^2x - sin^2x - 2 sinx/ cosx(1+sinx)

= -2sin^2x - 2sinx/ cosx (1+sinx)

= -2sinx(sinx+1)/cosx(1+sinx) =  2sinx/cosx = 2 tanx

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What is a number less than 400 but bigger than 312
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x can be a total of 87 numbers which are listed here:

<span> <span><span> 313, </span> <span> 314, </span> <span> 315, </span> <span> 316, </span> <span> 317, </span> <span> 318, </span> <span> 319, </span> <span> 320, </span> <span> 321, </span> <span> 322, </span> <span> 323, </span> <span> 324, </span> <span> 325, </span> <span> 326, </span> <span> 327, </span> <span> 328, </span> <span> 329, </span><span>330, </span> <span> 331, </span> <span> 332, </span> <span> 333, </span> <span> 334, </span> <span> 335, </span> <span> 336, </span> <span> 337, </span> <span> 338, </span> <span> 339, </span> <span> 340, </span> <span> 341, </span> <span> 342, </span> <span> 343, </span> <span> 344, </span> <span> 345, </span> <span> 346, </span><span>347, </span> <span> 348, </span> <span> 349, </span> <span> 350, </span> <span> 351, </span> <span> 352, </span> <span> 353, </span> <span> 354, </span> <span> 355, </span> <span> 356, </span> <span> 357, </span> <span> 358, </span> <span> 359, </span> <span> 360, </span> <span> 361, </span> <span> 362, </span> <span> 363, </span> <span> 364, </span> <span> 365, </span><span>366, </span> <span> 367, </span> <span> 368, </span> <span> 369, </span> <span> 370, </span> <span> 371, </span> <span> 372, </span> <span> 373, </span> <span> 374, </span> <span> 375, </span> <span> 376, </span> <span> 377, </span> <span> 378, </span> <span> 379, </span><span>380, </span><span>381, </span> <span> 382, </span> <span> 383, </span> <span> 384, </span> <span> 385, </span> <span> 386, </span> <span> 387, </span> <span> 388, </span> <span> 389, </span> <span> 390, </span> <span> 391, </span> <span> 392, </span> <span> 393, </span> <span> 394, </span> <span> 395, </span> <span> 396, </span> <span> 397, </span> <span> 398, and </span> <span> 399. </span> </span></span>



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