Find the value of (1 + cosA)(1 - cosA) cosec2A
Answers
Answered by
14
Answer:
→(1 + cosA)(1 - cosA) cosec2A
=>(1-cos^2A) cosec^2A.
=>sin^2A*cosec^2A.
=>1/cosec^2A*cosec^2A.
=>1.
Formula used.
- a^2-b^2=(a-b)(a+b).
- 1-cos^2a=sin^2a.
- sin^2A=1/cosec^2A.
Answered by
0
Answer:
1
Step-by-step explanation:
(1-cosA) (1+cosA) cosec^2A
=(1-cos^2A) cosec^2A
=sin^2A×cosec^2A
=sin^2A×1/sin^2A
=1
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