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Find exact values under the given conditions

3. Find the exact value of cos (a + b ) under the given conditions: tang = - <a<n; cosß = 1, 0<B<
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Problem or doubt in this then comment below.. i will explain you..

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coscatfla cos(a) cos(8) - Sinca) sin(B) pow fanda - 3/4 lt 16 - 5 3 secas Itatana .3 니 Coslala 5 u sinac wls sinisin sircost

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