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Yuri [45]
3 years ago
11

Helppppppppppppppppppp​

Mathematics
1 answer:
SashulF [63]3 years ago
4 0

Answer:

Option D: 2 . cos(90 + x) = -2a

Step-by-step explanation:

Given that:

sin x = a --------- eq1

As we know that trignometry says:

cos(90 + x) = -sinx-------- eq2

In option two we are given that:

cos(90 + x) = -2a ---------- eq3

So by equating both sides of eq2 and eq3:

-2a = -2sinx

By cancelling -2 from both sides we get:

sinx = a

That is given in eq1

hence proved

i hope it will help you!

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