mixture: trigonometric identities

Thursday, March 12, 2009

show that 4tan^4+tan^2x-3 = sec^2x(4tan^2x-3)

show that 4tan^4+tan^2x-3 = sec^2x(4tan^2x-3)
first factorise the LHS
then use the formula tan²x + 1 =sec² x

trigonometric identities

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