sec B 50. tan %3D sec B csc B + csc B х cot 2 52. tan -2 cot x %3D sin² 0 54. 2 sin? 1 + cos 0 56. 4 sin 0 =1- 2 cos 20 + cos² 20 chapters, the great circle distance (in radians) LT,, LN,), whose coordinates are given as 29 ng the formula cos (LT) cos (LT,) cos (LN - LN2)) 2.

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