find the value of: cos 120°.sin150°+sin° 120 .sin150.
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Step-by-step explanation:
i think there is an error in the question
it is cos120.sin150+sin120.cos150
if it is so then
sin150=1/2
sin120=√3/2
cos120= -1/2
cos150= -√3/2
= -1/2*1/2+√3/2*-√3/2
= -1/4+-3/4
= -1
if it is not so then
= -1/2*1/2+√3/2*1/2
= -1/4+√3/4
=(√3-1)/4
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