2 answers:
Step-by-step explanation:
1/sin^2A -cos^2A/sin^2 A. ~tan = sin/cos
(1-cos^2)/sin^2A. ~ take lcm
sin^2A/sin^ A. ~ 1-cos^2A = sin^2A
1
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Answer:

Step-by-step explanation:
Prove that:

Recall that by definition:

Therefore,

Substitute
into
:

Simplify:

Combine like terms:

Recall the following Pythagorean Identity:
(derived from the Pythagorean Theorem)
Subtract
from both sides:

Finish by substituting
into
:

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Step-by-step explanation:
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Answer:
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x=-3/2 ANSWER
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