Question

value
of determinate
cos 50
sin yo
sin so
cos 40​

Answer 1

Answer:sin(90-50) sin 40 + cos (90-50) cos 40

sin40 sin40 + cos40 cos40

sin^2 40 + cos^2 40

(since sin @ + cos@ =1)

so sin^2 40 + cos^2 40 = 1

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Step-by-step explanation: