if A=30°, then 3sinA - 4sin³A=?
Answers
Answered by
1
Step-by-step explanation:
sin3A=sin3(30
o
)=sin90
o
=1
3sinA−4sin
3
A=3sin30
o
−4sin
3
30
o
=3(
2
1
)−4(
2
1
)
3
=
2
3
−
2
1
=1
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