Question

Cos a+ sin a/cos a - sin a

Answer 1

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sina+cosa

=1sina+1cosa

=2–√(12–√sina+12–√cosa)

=2–√(cosπ4sina+sinπ4cosa)

=2–√sin(a+π4)

Answer 2

sina+cosa

=1sina+1cosa

=2–√(12–√sina+12–√cosa)

=2–√(cosπ4sina+sinπ4cosa)

=2–√sin(a+π4)

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