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1 + tgx — — 2tgx cos x 2 cos (l + tgx)2 1 + tgx — x cos x cos I —sin x ... 2 cos2X+1 = 2cosx —I 2 COS X 10. stn— — szn— stn— + COS X — 2 sin 1 — sin sin —+1 — ... sin x +1 —sin x = sm x —sžnx— —/.(-1) sznx ili x = + 217t 12. cosx— cos2x=1 cos x —cos x + sin x = I sznx o cosx— cos x +1 —cos2 x = —2 ... ................
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