The value of sin310∘+sin350∘−sin370∘ is equal to
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a
-32
b
34
c
-34
d
-38
answer is D.
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Detailed Solution
We have sin310∘+sin350∘−sin370∘=143sin10∘−sin30∘+3sin50∘−sin150∘−3sin70∘−sin210∘=143sin10∘+sin50∘−sin70∘−32=143sin10∘−2cos60∘⋅sin10∘−32=−38