SinA= 0.4 then find Sin 3A
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sin A = 0.4 we can write it as 2/5
so cosA = root21
Sin3A=3SinA-4Sin³A
3*2/5-4*8/125
6/5 - 32/125
150-32/125
118/125 i the answer
Answered by
2
Answer:sin A = 0.4 we can write it as 2/5
so cosA = root21
Sin3A=3SinA-4Sin³A
3*2/5-4*8/125
6/5 - 32/125
150-32/125
118/125 is the answer
Step-by-step explanation:
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