1.

(3) दाखवा की, 500 -- 008

Answer»

sin⁴θ - cos⁴θ

(sin²θ)² - (cos²θ)²

( sin²θ + cos²θ ) ( sin²θ - cos²θ )

sin²θ - cos²θ

1 - cos²θ - cos²θ

1 - 2cos²θ



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