What is the value of {\cos ⁡(50^{ \circ } + A)− \sin ⁡(40^{ \circ }−A)}/{\cos ⁡40^{ \circ } \sec ⁡40^{ \circ }}?

SSC CHSL 10 mar 2023 Shift 1 Paper

Section: Quantitative Aptitude

Question : 62 of 100

Marks: +1, -0

What is the value of

\;{\cos\;⁡(50^{\;∘\;}\;+\;A)−\ sin\;⁡(40^{\;∘\;}−A)}/{\cos\;⁡40^{\;∘\;}\ sec ⁡40^{ ∘ }}

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