Question
Calculate the value of sin120 o + cos180
o + tan225 o .Solution
sin120 o + cos180 o + tan225 o
= sin(90 + 30) o + cos180 o + tan(180 + 45) o
= cos30 o + cos180 o + tan45 o
= √3/2 + (-1) + 1 = √3/2
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