Find the value of (cos^67°-sin^23°)?
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= Cos² 67° - Sin² 23°
= Cos² 67° - Sin²(90-67°)
= Cos² 67° - Cos² 67°
(because Sin(90 - Θ) = CosΘ)
= 0
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☺ ☺ ☺ Hope this Helps ☺ ☺ ☺
= Cos² 67° - Sin²(90-67°)
= Cos² 67° - Cos² 67°
(because Sin(90 - Θ) = CosΘ)
= 0
__________________________________________________________
☺ ☺ ☺ Hope this Helps ☺ ☺ ☺
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