2. (a) Prove that :
(1) tan 15° + cot 15° = 4
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Step-by-step explanation:
tanx+cotx=tanx+1/tanx
=tan²x+1/tanx
=sec²x/tanx
=1/cos²xcosx/sinx
=1/sinxcosx
=2/sinxcosx
=2/sin2x
from this formula
=tan(15)+cot(15)=2/sin30°
=2/1/2
=4
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