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3 years ago

PLEASE HELP ASAP!!

Mathematics

1 answer:

alex41 [277]3 years ago

7 0

Step-by-step explanation:

e = 20sin(πt/4 - π/2)

= 20[(sinπt/4)(cosπ/2) - (cosπt/4)(sinπ/2)]

Used sin(x - y) = sinxcosy - cosxsiny.

= 20[0 - cosπt/4]

Since cosπ/2 = 0 and sinπ/2 = 1.

= -20cosπt/4.

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