1.

Prove that sin²48°+sin²42° = 1​

Answer»

Answer:

SIN and cos are COMPLEMENTARY RATIOS

=> sinθ = cos(90°-θ)

sin²48° + sin²42° = sin²48° + cos²(90-42)°

                            = sin²48° + cos²48°

                            = 1 = R.H.S                                       [sin²θ + cos²θ = 1]



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