Evaluate without using table:
cos65*cos25-sin65*sin25
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Step-by-step explanation:
( Sin 25°) { Cos (90° - 25°)} + Cos 25° { Sin (90° - 25° )}
= (Sin 25° ) (Sin 25° ) + ( Cos 25°) (Cos 25°)
= Sin² 25° + Cos² 25°
= 1( As Sin² A + Cos² A = 1)
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