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56. If cos (40° + A) = sin 30°, the value of A is _____ .

56. If cos (40° + A) = sin 30°, the value of A is _____ .



Grade:12th pass

1 Answers

Pawan Prajapati
askIITians Faculty 8740 Points
4 months ago
Answer: Explaination: Hint: cos (40° + A) = sin 30° ⇒ cos (40° + A) = cos (90° – 30°) ⇒ 40° + A = 60° => A = 20

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