Solution

prove

Solution

Solution steps
Show that the two sides are not equal
For plug in
Simplify
Use the following trivial identity:
periodicity table with cycle:
Use the following trivial identity:
periodicity table with cycle:
The two sides are not equal

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Frequently Asked Questions (FAQ)

  • Is sin(a+90)=cos(90) ?

    The answer to whether sin(a+90)=cos(90) is False