prove that cos(270°-A)= -sinA
Answers
Answered by
1
Answer:
cos(3π/2-A)
we know that 3π/2 is changed the value to sinA
in third quadrant cos is negative so -sin A
Answered by
1
Answer:
yes
Step-by-step explanation:
cos (270°-A) = cos (π-90°-A)
= cos[π - (90°+ A)]
= cos [90°+A]
= -sinA
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