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trigonometry all Imp formula please
mansigupta23:
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Important points to remember.
1)Basic formulae
sin²∅=cos²∅=1
sec²∅=1+tan²∅
2) Thinking order formulae
tan(a+b)=tan a + tan b /1-tan a + tan b
tan(a-b)=tan a - tan b/1+tan a -tan b
3)skillful formulae
SIN c + sin d =2(sin +d/2)cos (c-d/2)
1)Basic formulae
sin²∅=cos²∅=1
sec²∅=1+tan²∅
2) Thinking order formulae
tan(a+b)=tan a + tan b /1-tan a + tan b
tan(a-b)=tan a - tan b/1+tan a -tan b
3)skillful formulae
SIN c + sin d =2(sin +d/2)cos (c-d/2)
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