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Value of cos0^(@). Cos 30^(@) . cos45^(@...

Value of `cos0^(@). Cos 30^(@) . cos45^(@) . cos60^(@) . Cos90^(@)` is __________.

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OSWAL PUBLICATION-INTRODUCTION TO TRIGONOMETRY AND TRIGONOMETRIC IDENTITIES -SELF ASSESSMENT - 1 (I. Objective Type Questions:) ( [B] Fill in the Blanks)
  1. Value of cos0^(@). Cos 30^(@) . cos45^(@) . cos60^(@) . Cos90^(@) is ...

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  2. Value of (sin30^@ + cos 30^@) - (sin60^@ + cos60^@) is

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