cravens511peeelg
13.07.2019 •
Mathematics
Prove the following 1- sin a sin (90-1)/cot (90-a)= sin^2 a
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Ответ:
Im going to assume its (90 - A) so we have:-
1 - sinA sin (90 - A) / cot (90 - A)
Convert to sines and cosines:-
= 1 - (sin A cos A) / cos ( 90 - A) / sin ( 90 - A)
= 1 - (sin A cos A) / sin A / cos A
= 1 - cos^2 A
= sin^2 A which is what is required.
Ответ:
v=LxWxH
v= 3/2x5/3x4
v=15/6x4
v=10in³