If cot A= 12/5 and A is acute find sin3A and cos3APls solve this fr me
If cot A= 12/5 and A is acute find sin3A and cos3A
Pls solve this fr me
Nidhi Bhat , 8 Years ago
Grade 11
Trigonometry> If cot A= 12/5 and A is acute find sin3A ...
1 Answers
Ajay
Last Activity: 8 Years ago
since cot A = base/perpclr we have base = 12 and perplr = 5
htpns = sqrt(144 + 25) = 13
hence Sin A = perpn/hyptns = 5/13
Now Sin 3A = 3sin A – 4 sin3 A
Sin 3A = 3*5/13 – 4 (5/13)3 = 2035/2197
Now you can find Cos 3A = sqrt(1-Sin2 3A)
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