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3 years ago

Please help me do 9c fast please

Mathematics

1 answer:

Assoli18 [71]3 years ago

6 0

Answer:

see explanation

Step-by-step explanation:

Using double angle formulae for cosine and sine

Consider left side

cos4θ

= cos2(2θ)

= cos²(2θ) - sin²(2θ)

= [ cos²θ - sin²θ ]² - (2sinθcosθ)²

= [ (1 - sin²θ - sin²θ ]² - (2sinθcosθ)²

= (1 - 2sin²θ )² - (2sinθcosθ)²

= 1 + 4 $sin^{4}$ θ - 4sin²θ - 4sin²θcos²θ

= 1 + 4 $sin^{4}$ θ - 4sin²θ - 4(1 - sin²θ)sin²θ

= 1 + 4 $sin^{4}$ θ - 4sin²θ - 4sin²θ + 4 $sin^{4}$ θ

= 1 - 8sin²θ + 8 $sin^{4}$ θ

= right side , thus proven

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3 years ago

Which expression is not equivalent to (x + 4)(x – 3)?

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Answer:

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3 years ago

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shutvik [7]

Answer:

Rs 600,000

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4 years ago

900 × 129 please help me

Anastasy [175]

900 × 126= 116,100. Hoped this helped.

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3 years ago

Read 2 more answers

Please help me do 9c fast please ​

Please help me do 9c fast please