Question

2 cos squared theta minus one= cos squared theta minus sin squared theta

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Answer 1

Step-by-step explanation:

• LHS =2 cos squared theta
• 2 ( 1 - sin squared theta ) - 1
• 2 - 2 sin squared theta - 1
• 1 - 2 sin squared theta
• sin squared theta+cos squared theta-2 sin squared theta
• ie, cos squared theta - sin squared theta
• = RHS
• HENCE PROVED

Answer 2

Step-by-step explanation:

LHS= RHS

hence proved

in the above picture this problem was proved