Question
Find the value of [cos25°−sin65°]/
[cos25°+sin65°].Solution
 [cos25°−sin65°]/ [cos25°+sin65°].  Use the identity sin 65° = cos (90° - 65°) Since sin 65°= cos 25°, the expression becomes- [cos 25° - cos 25°]/ [cos 25° + cos 25°]  = 0/2cos25° =0 So, the value of the expression is 0.
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