Math, asked by reez68, 6 hours ago

Prove the following questions of Opptional mathematics

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Answered by pyakurelsalina78

0

marks as brainlest

This is the solution

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Answered by boAtHead007

0

Answer:

cos⁴ø-sin⁴ø = cos²ø-sin²ø

Step-by-step explanation:

(cos²ø)²-(sin²ø)²= (cos²ø+sin²ø)(cos²ø-sin²ø)

therefore, cos⁴ø-sin⁴ø = (cos²ø-sin²ø) (1)

cos⁴ø-sin⁴ø = cos²ø-sin²ø

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