1) simplify cos ( pie/3 + x ) - sin ( pie/6 - x )
2) prove that cos ( 3pie /4 +x ) - cos(3pie/4-x) = - root 2 sin x
3) prove that sin 18° = root 5-1/4, cos 36° = root 5+1/4.
please answer these questions step by step perfectly.
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1) 0
2) -√2sinx (proved)
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* Cox (60+2) - Sin (30-x).
= cos60 cosa-sinto sinx-(singo (asx- (6550-sinx)
cos (34 +2) - (0.5 (37-2). - Jisinx
3 (155-+2) = (as (135-2) - - √₂. sinx
* cos((39)-cocx-str(39) sinx- (cos(35), 605 x +sin (35).
sim 2 sin
(85 (90+45) 083x sin (90+16) sina-cosplotus)-cosa-sin
1. sinna sina = -√2 singa. (moved)
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