Question

If Sin (A+B=1) and cos B =1/2 find LA, LB (0°​

Answer 1

Answer:

sin(a+b) = 1

=> a + b = π/2 = 90°

cos b = 1/2

=> b = π/3 = 60°

=> L a = π/6 = 30°

=> L b = π/3 = 60°

Answer 2

Answer:

∠A=30°, ∠B=60°

Step-by-step explanation:

sin(A+B) = 1

sin 90° = 1

∴ (A+B) = 90°,-----(1)

cos B = 1/2

cos 60° = 1/2

∴ B=60°

substitute B=60° in (1)

=} A+B=90°

=}A+(60°)=90°

=}A=90°-60°

=}A=30°

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